diff --git a/app/src/androidTest/java/com/example/slowclock/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/example/slowclock/ExampleInstrumentedTest.kt
index 67e70b9c..a103c0c3 100644
--- a/app/src/androidTest/java/com/example/slowclock/ExampleInstrumentedTest.kt
+++ b/app/src/androidTest/java/com/example/slowclock/ExampleInstrumentedTest.kt
@@ -17,6 +17,6 @@ class ExampleInstrumentedTest {
     fun useAppContext() {
         // Context of the app under test.
         val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.example.slowclock", appContext.packageName)
+        assertEquals("com.ilhyok.slowclock", appContext.packageName)
     }
 }
diff --git a/app/src/androidTest/java/com/example/slowclock/UiRecoveryTest.kt b/app/src/androidTest/java/com/example/slowclock/UiRecoveryTest.kt
new file mode 100644
index 00000000..756c21ce
--- /dev/null
+++ b/app/src/androidTest/java/com/example/slowclock/UiRecoveryTest.kt
@@ -0,0 +1,88 @@
+package com.example.slowclock
+
+import androidx.compose.runtime.CompositionLocalProvider
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.test.assertHasNoClickAction
+import androidx.compose.ui.test.assertIsDisplayed
+import androidx.compose.ui.test.assertIsEnabled
+import androidx.compose.ui.test.junit4.createComposeRule
+import androidx.compose.ui.test.onNodeWithContentDescription
+import androidx.compose.ui.test.onNodeWithText
+import androidx.compose.ui.test.performClick
+import androidx.compose.ui.test.performScrollTo
+import androidx.compose.ui.unit.Density
+import com.example.slowclock.data.model.Schedule
+import com.example.slowclock.ui.common.components.ErrorCard
+import com.example.slowclock.ui.common.components.ScheduleRow
+import com.example.slowclock.ui.main.components.ScheduleDetailDialog
+import com.example.slowclock.ui.theme.SlowClockTheme
+import com.example.slowclock.util.AppError
+import com.google.firebase.Timestamp
+import org.junit.Assert.assertEquals
+import org.junit.Rule
+import org.junit.Test
+import java.util.Date
+
+class UiRecoveryTest {
+    @get:Rule
+    val compose = createComposeRule()
+
+    @Test
+    fun nonRetryableErrorCanBeDismissed() {
+        var dismisses = 0
+        compose.setContent {
+            SlowClockTheme(darkTheme = false) {
+                ErrorCard(error = AppError.PermissionError, canRetry = false, onDismiss = { dismisses++ })
+            }
+        }
+        compose.onNodeWithText("다시 시도").assertDoesNotExist()
+        compose.onNodeWithText("닫기").assertIsEnabled().performClick()
+        compose.runOnIdle { assertEquals(1, dismisses) }
+    }
+
+    @Test
+    fun nonClickableRowIsNotDisabledAndItsCompletionActionWorks() {
+        var toggles = 0
+        compose.setContent {
+            SlowClockTheme(darkTheme = false) {
+                ScheduleRow(title = "혈압약 먹기", time = Date(0), completed = false, onToggleComplete = { toggles++ })
+            }
+        }
+        compose.onNodeWithText("혈압약 먹기").assertIsEnabled().assertHasNoClickAction()
+        compose.onNodeWithContentDescription("완료로 표시").assertIsEnabled().performClick()
+        compose.runOnIdle { assertEquals(1, toggles) }
+    }
+
+    @Test
+    fun longDetailAtLargeFontCanScrollToActions() {
+        var deletes = 0
+        var dismisses = 0
+        compose.setContent {
+            val density = LocalDensity.current
+            CompositionLocalProvider(LocalDensity provides Density(density.density, fontScale = 2f)) {
+                SlowClockTheme(darkTheme = false) {
+                    ScheduleDetailDialog(
+                        schedule =
+                            Schedule(
+                                id = "detail",
+                                title = "혈압약 먹기",
+                                description = List(30) { "식사 후 물과 함께 복용해주세요." }.joinToString("\n"),
+                                startTime = Timestamp(Date(0)),
+                            ),
+                        onDismiss = { dismisses++ },
+                        onDelete = { deletes++ },
+                    )
+                }
+            }
+        }
+        compose
+            .onNodeWithText("삭제")
+            .performScrollTo()
+            .assertIsDisplayed()
+            .performClick()
+        compose.runOnIdle {
+            assertEquals(1, deletes)
+            assertEquals(1, dismisses)
+        }
+    }
+}
diff --git a/app/src/screenshotTest/java/com/example/slowclock/RecommendationLargeTextScreenshotTest.kt b/app/src/screenshotTest/java/com/example/slowclock/RecommendationLargeTextScreenshotTest.kt
new file mode 100644
index 00000000..8a6f0cee
--- /dev/null
+++ b/app/src/screenshotTest/java/com/example/slowclock/RecommendationLargeTextScreenshotTest.kt
@@ -0,0 +1,20 @@
+package com.example.slowclock
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.tooling.preview.Preview
+import com.android.tools.screenshot.PreviewTest
+import com.example.slowclock.ui.addschedule.components.RecommendationPlaceholder
+import com.example.slowclock.ui.theme.SlowClockTheme
+
+@PreviewTest
+@Preview(name = "추천 카드 큰 글자 320", widthDp = 320, heightDp = 480, fontScale = 2f)
+@Preview(name = "추천 카드 큰 글자 360", widthDp = 360, heightDp = 480, fontScale = 2f)
+@Composable
+internal fun RecommendationLargeTextScreenshot() {
+    SlowClockTheme(darkTheme = false) {
+        Column {
+            RecommendationPlaceholder(onNavigateToRecommendation = {})
+        }
+    }
+}
diff --git "a/app/src/screenshotTestDebug/reference/com/example/slowclock/RecommendationLargeTextScreenshotTestKt/RecommendationLargeTextScreenshot_\354\266\224\354\262\234 \354\271\264\353\223\234 \355\201\260 \352\270\200\354\236\220 320_dfadd674_0.png" "b/app/src/screenshotTestDebug/reference/com/example/slowclock/RecommendationLargeTextScreenshotTestKt/RecommendationLargeTextScreenshot_\354\266\224\354\262\234 \354\271\264\353\223\234 \355\201\260 \352\270\200\354\236\220 320_dfadd674_0.png"
new file mode 100644
index 00000000..7454a16a
Binary files /dev/null and "b/app/src/screenshotTestDebug/reference/com/example/slowclock/RecommendationLargeTextScreenshotTestKt/RecommendationLargeTextScreenshot_\354\266\224\354\262\234 \354\271\264\353\223\234 \355\201\260 \352\270\200\354\236\220 320_dfadd674_0.png" differ
diff --git "a/app/src/screenshotTestDebug/reference/com/example/slowclock/RecommendationLargeTextScreenshotTestKt/RecommendationLargeTextScreenshot_\354\266\224\354\262\234 \354\271\264\353\223\234 \355\201\260 \352\270\200\354\236\220 360_a59ce89d_0.png" "b/app/src/screenshotTestDebug/reference/com/example/slowclock/RecommendationLargeTextScreenshotTestKt/RecommendationLargeTextScreenshot_\354\266\224\354\262\234 \354\271\264\353\223\234 \355\201\260 \352\270\200\354\236\220 360_a59ce89d_0.png"
new file mode 100644
index 00000000..f56d883f
Binary files /dev/null and "b/app/src/screenshotTestDebug/reference/com/example/slowclock/RecommendationLargeTextScreenshotTestKt/RecommendationLargeTextScreenshot_\354\266\224\354\262\234 \354\271\264\353\223\234 \355\201\260 \352\270\200\354\236\220 360_a59ce89d_0.png" differ
diff --git a/core/common/src/main/java/com/example/slowclock/util/ErrorType.kt b/core/common/src/main/java/com/example/slowclock/util/ErrorType.kt
index e81fcda3..044d1526 100644
--- a/core/common/src/main/java/com/example/slowclock/util/ErrorType.kt
+++ b/core/common/src/main/java/com/example/slowclock/util/ErrorType.kt
@@ -41,5 +41,5 @@ fun Throwable.toAppError(): AppError =
         message?.contains("not found", ignoreCase = true) == true -> AppError.NotFoundError
         message?.contains("authentication", ignoreCase = true) == true -> AppError.AuthError
         message?.contains("storage", ignoreCase = true) == true -> AppError.StorageFullError
-        else -> AppError.GeneralError(message)
+        else -> AppError.GeneralError()
     }
diff --git a/core/common/src/test/java/com/example/slowclock/util/ErrorTypeTest.kt b/core/common/src/test/java/com/example/slowclock/util/ErrorTypeTest.kt
new file mode 100644
index 00000000..4128446f
--- /dev/null
+++ b/core/common/src/test/java/com/example/slowclock/util/ErrorTypeTest.kt
@@ -0,0 +1,19 @@
+package com.example.slowclock.util
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class ErrorTypeTest {
+    @Test
+    fun `분류하지 못한 예외는 내부 메시지 대신 기본 안내를 낸다`() {
+        assertEquals(AppError.GeneralError().message, IllegalStateException("INTERNAL transport closed").toAppError().message)
+        assertEquals(AppError.GeneralError().message, RuntimeException().toAppError().message)
+    }
+
+    @Test
+    fun `알려진 오류와 앱이 작성한 안내는 유지한다`() {
+        assertEquals(AppError.NetworkError, RuntimeException("NETWORK unavailable").toAppError())
+        assertEquals(AppError.TimeoutError, RuntimeException("timeout").toAppError())
+        assertEquals("일정 제목을 입력해주세요", AppError.GeneralError("일정 제목을 입력해주세요").message)
+    }
+}
diff --git a/core/ui/src/main/java/com/example/slowclock/ui/common/components/BottomNavigationBar.kt b/core/ui/src/main/java/com/example/slowclock/ui/common/components/BottomNavigationBar.kt
index b9bb6e87..7e839482 100644
--- a/core/ui/src/main/java/com/example/slowclock/ui/common/components/BottomNavigationBar.kt
+++ b/core/ui/src/main/java/com/example/slowclock/ui/common/components/BottomNavigationBar.kt
@@ -46,12 +46,12 @@ fun BottomNavigationBar(
                         indicatorColor = MaterialTheme.colorScheme.primaryContainer,
                     ),
                 icon = { Icon(item.icon, contentDescription = null) },
-                // 글꼴을 키우면 두 줄로 흘러 옆 항목과 겹친다. 한 줄로 고정한다.
+                // 큰 글자에서도 「시간표」의 끝 글자가 잘리지 않도록 줄바꿈을 허용한다.
                 label = {
                     Text(
                         text = item.label,
                         style = MaterialTheme.typography.labelLarge,
-                        maxLines = 1,
+                        maxLines = 2,
                     )
                 },
             )
diff --git a/core/ui/src/main/java/com/example/slowclock/ui/common/components/ErrorCard.kt b/core/ui/src/main/java/com/example/slowclock/ui/common/components/ErrorCard.kt
index 9002df1c..cde0afe5 100644
--- a/core/ui/src/main/java/com/example/slowclock/ui/common/components/ErrorCard.kt
+++ b/core/ui/src/main/java/com/example/slowclock/ui/common/components/ErrorCard.kt
@@ -2,6 +2,7 @@ package com.example.slowclock.ui.common.components
 
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.FlowRow
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -10,6 +11,7 @@ import androidx.compose.foundation.layout.heightIn
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.widthIn
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Refresh
 import androidx.compose.material.icons.outlined.Block
@@ -32,6 +34,7 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import com.example.slowclock.util.AppError
@@ -107,33 +110,39 @@ fun ErrorCard(
                 textAlign = TextAlign.Center,
             )
 
-            if (canRetry && onRetry != null) {
+            if (onDismiss != null || (canRetry && onRetry != null)) {
                 Spacer(modifier = Modifier.height(20.dp))
 
-                Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
+                val actionMinWidth = 144.dp * LocalDensity.current.fontScale
+                FlowRow(
+                    horizontalArrangement = Arrangement.spacedBy(12.dp),
+                    verticalArrangement = Arrangement.spacedBy(12.dp),
+                ) {
                     if (onDismiss != null) {
                         OutlinedButton(
                             onClick = onDismiss,
                             shape = MaterialTheme.shapes.small,
-                            modifier = Modifier.weight(1f).heightIn(min = 56.dp),
+                            modifier = Modifier.widthIn(min = actionMinWidth).weight(1f).heightIn(min = 56.dp),
                         ) {
                             Text(text = "닫기", style = MaterialTheme.typography.labelLarge)
                         }
                     }
 
-                    Button(
-                        onClick = onRetry,
-                        shape = MaterialTheme.shapes.small,
-                        modifier = Modifier.weight(1f).heightIn(min = 56.dp),
-                        colors =
-                            ButtonDefaults.buttonColors(
-                                containerColor = MaterialTheme.colorScheme.error,
-                                contentColor = MaterialTheme.colorScheme.onError,
-                            ),
-                    ) {
-                        Icon(Icons.Default.Refresh, contentDescription = null)
-                        Spacer(modifier = Modifier.width(8.dp))
-                        Text(text = "다시 시도", style = MaterialTheme.typography.labelLarge)
+                    if (canRetry && onRetry != null) {
+                        Button(
+                            onClick = onRetry,
+                            shape = MaterialTheme.shapes.small,
+                            modifier = Modifier.widthIn(min = actionMinWidth).weight(1f).heightIn(min = 56.dp),
+                            colors =
+                                ButtonDefaults.buttonColors(
+                                    containerColor = MaterialTheme.colorScheme.error,
+                                    contentColor = MaterialTheme.colorScheme.onError,
+                                ),
+                        ) {
+                            Icon(Icons.Default.Refresh, contentDescription = null)
+                            Spacer(modifier = Modifier.width(8.dp))
+                            Text(text = "다시 시도", style = MaterialTheme.typography.labelLarge)
+                        }
                     }
                 }
             }
diff --git a/core/ui/src/main/java/com/example/slowclock/ui/common/components/ScheduleRow.kt b/core/ui/src/main/java/com/example/slowclock/ui/common/components/ScheduleRow.kt
index 47fc5fe1..018e8992 100644
--- a/core/ui/src/main/java/com/example/slowclock/ui/common/components/ScheduleRow.kt
+++ b/core/ui/src/main/java/com/example/slowclock/ui/common/components/ScheduleRow.kt
@@ -12,6 +12,7 @@ import androidx.compose.foundation.layout.heightIn
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.widthIn
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.CheckCircle
@@ -65,18 +66,10 @@ fun ScheduleRow(
             MaterialTheme.colorScheme.onSurface
         }
 
-    Surface(
-        onClick = onClick ?: {},
-        enabled = onClick != null,
+    ScheduleRowSurface(
+        onClick = onClick,
+        completed = completed,
         modifier = modifier.fillMaxWidth(),
-        shape = MaterialTheme.shapes.medium,
-        color =
-            if (completed) {
-                MaterialTheme.colorScheme.surfaceContainerLow
-            } else {
-                MaterialTheme.colorScheme.surface
-            },
-        border = BorderStroke(1.dp, MaterialTheme.colorScheme.outlineVariant),
     ) {
         Row(
             modifier =
@@ -86,7 +79,7 @@ fun ScheduleRow(
                     .padding(start = 16.dp, end = 8.dp, top = 10.dp, bottom = 10.dp),
             verticalAlignment = Alignment.CenterVertically,
         ) {
-            Column(modifier = Modifier.width(64.dp)) {
+            Column(modifier = Modifier.widthIn(min = 64.dp)) {
                 Text(
                     text = meridiem,
                     style = MaterialTheme.typography.labelSmall,
@@ -94,6 +87,7 @@ fun ScheduleRow(
                 )
                 Text(
                     text = clock,
+                    maxLines = 1,
                     style = MaterialTheme.typography.titleMedium,
                     color = titleColor,
                 )
@@ -154,3 +148,26 @@ fun ScheduleRow(
         }
     }
 }
+
+@Composable
+private fun ScheduleRowSurface(
+    onClick: (() -> Unit)?,
+    completed: Boolean,
+    modifier: Modifier = Modifier,
+    content: @Composable () -> Unit,
+) {
+    val color = if (completed) MaterialTheme.colorScheme.surfaceContainerLow else MaterialTheme.colorScheme.surface
+    val border = BorderStroke(1.dp, MaterialTheme.colorScheme.outlineVariant)
+    if (onClick == null) {
+        Surface(modifier = modifier, shape = MaterialTheme.shapes.medium, color = color, border = border, content = content)
+    } else {
+        Surface(
+            onClick = onClick,
+            modifier = modifier,
+            shape = MaterialTheme.shapes.medium,
+            color = color,
+            border = border,
+            content = content,
+        )
+    }
+}
diff --git a/feature/addschedule/src/main/java/com/example/slowclock/ui/addschedule/components/RecommendationPlaceholder.kt b/feature/addschedule/src/main/java/com/example/slowclock/ui/addschedule/components/RecommendationPlaceholder.kt
index 3c010f38..3da91ea5 100644
--- a/feature/addschedule/src/main/java/com/example/slowclock/ui/addschedule/components/RecommendationPlaceholder.kt
+++ b/feature/addschedule/src/main/java/com/example/slowclock/ui/addschedule/components/RecommendationPlaceholder.kt
@@ -30,13 +30,13 @@ fun RecommendationPlaceholder(
             modifier =
                 Modifier
                     .fillMaxWidth()
-                    .height(140.dp)
+                    .heightIn(min = 140.dp)
                     .padding(24.dp),
             contentAlignment = Alignment.Center,
         ) {
             Column(horizontalAlignment = Alignment.CenterHorizontally) {
                 Text(
-                    text = "🔮 일정 추천해드릴까요?",
+                    text = "일정 추천해드릴까요?",
                     style = MaterialTheme.typography.titleLarge,
                     color = MaterialTheme.colorScheme.onTertiaryContainer,
                 )
diff --git a/feature/main/src/main/java/com/example/slowclock/ui/common/ExternalActivityLauncher.kt b/feature/main/src/main/java/com/example/slowclock/ui/common/ExternalActivityLauncher.kt
new file mode 100644
index 00000000..5fd7174e
--- /dev/null
+++ b/feature/main/src/main/java/com/example/slowclock/ui/common/ExternalActivityLauncher.kt
@@ -0,0 +1,20 @@
+package com.example.slowclock.ui.common
+
+import android.content.ActivityNotFoundException
+import android.util.Log
+
+/** 시스템 설정이나 브라우저가 없거나 정책으로 막힌 기기에서도 현재 화면을 유지한다. */
+internal fun launchExternalActivity(
+    open: () -> Unit,
+    fallback: (() -> Unit)? = null,
+): Boolean {
+    try {
+        open()
+        return true
+    } catch (e: ActivityNotFoundException) {
+        Log.w("ExternalActivity", "외부 화면을 열지 못했다", e)
+    } catch (e: SecurityException) {
+        Log.w("ExternalActivity", "외부 화면이 허용되지 않았다", e)
+    }
+    return fallback?.let { launchExternalActivity(it) } ?: false
+}
diff --git a/feature/main/src/main/java/com/example/slowclock/ui/common/ScheduleLoadingIndicator.kt b/feature/main/src/main/java/com/example/slowclock/ui/common/ScheduleLoadingIndicator.kt
new file mode 100644
index 00000000..3c0f110a
--- /dev/null
+++ b/feature/main/src/main/java/com/example/slowclock/ui/common/ScheduleLoadingIndicator.kt
@@ -0,0 +1,28 @@
+package com.example.slowclock.ui.common
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+
+@Composable
+internal fun ScheduleLoadingIndicator(
+    modifier: Modifier = Modifier,
+    message: String = "일정을 불러오고 있습니다",
+) {
+    Row(
+        modifier = modifier.padding(vertical = 16.dp),
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.spacedBy(12.dp),
+    ) {
+        CircularProgressIndicator(modifier = Modifier.size(24.dp))
+        Text(text = message, style = MaterialTheme.typography.bodyLarge)
+    }
+}
diff --git a/feature/main/src/main/java/com/example/slowclock/ui/done/DoneScreen.kt b/feature/main/src/main/java/com/example/slowclock/ui/done/DoneScreen.kt
index 8ab55dac..82fbd3b1 100644
--- a/feature/main/src/main/java/com/example/slowclock/ui/done/DoneScreen.kt
+++ b/feature/main/src/main/java/com/example/slowclock/ui/done/DoneScreen.kt
@@ -19,6 +19,7 @@ import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.compose.LifecycleEventEffect
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.example.slowclock.ui.common.ScheduleLoadingIndicator
 import com.example.slowclock.ui.common.components.DayProgress
 import com.example.slowclock.ui.common.components.EmptyState
 import com.example.slowclock.ui.common.components.ErrorCard
@@ -77,7 +78,11 @@ internal fun DoneContent(
             )
         }
 
+        if (state.isLoading) {
+            ScheduleLoadingIndicator()
+        }
         if (completed.isEmpty() && remaining.isEmpty()) {
+            if (state.isLoading || state.error != null) return@Column
             EmptyState(
                 icon = Icons.Outlined.TaskAlt,
                 title = "오늘 일정이 없습니다",
diff --git a/feature/main/src/main/java/com/example/slowclock/ui/main/MainContract.kt b/feature/main/src/main/java/com/example/slowclock/ui/main/MainContract.kt
index ad14311d..acaf6795 100644
--- a/feature/main/src/main/java/com/example/slowclock/ui/main/MainContract.kt
+++ b/feature/main/src/main/java/com/example/slowclock/ui/main/MainContract.kt
@@ -44,8 +44,19 @@ sealed interface MainIntent : MviIntent {
     data object DismissExactAlarmNotice : MainIntent
 
     data object ConsumeExactAlarmSettingsRequest : MainIntent
+
+    data object ExactAlarmSettingsUnavailable : MainIntent
+
+    data object ConsumeUserMessage : MainIntent
 }
 
+/** 동일한 일정을 다시 삭제하더라도 늦은 이전 응답과 구분한다. */
+data class DeleteOperation(
+    val schedule: Schedule,
+    val userId: String,
+    val requestId: String,
+)
+
 /** 메인 화면의 단일 UI 상태. 오늘 일정과 공유 일정, 다이얼로그 상태를 담는다. */
 data class MainUiState(
     val todaySchedules: List<Schedule> = emptyList(),
@@ -60,6 +71,9 @@ data class MainUiState(
     val selectedScheduleForDetail: Schedule? = null,
     /** null 이 아니면 삭제 확인 다이얼로그가 떠 있다. */
     val scheduleToDelete: Schedule? = null,
+    val pendingDelete: DeleteOperation? = null,
+    /** 목록 스냅샷이 와도 사용자가 재시도하거나 닫을 때까지 실패 작업을 보존한다. */
+    val failedDelete: DeleteOperation? = null,
     val currentUserId: String = "",
     /** 로그인 여부를 아직 모르는 동안에는 로그인 안내를 띄우지 않는다. */
     val isSignedInKnown: Boolean = false,
@@ -67,6 +81,7 @@ data class MainUiState(
     val showExactAlarmNotice: Boolean = false,
     /** null 이 아니면 화면이 시스템 설정을 한 번 연다. */
     val openExactAlarmSettings: Unit? = null,
+    val userMessage: String? = null,
 ) : UiState
 
 /** 메인 화면의 상태가 겪은 것. 화면은 만들지 않고 ViewModel 만 dispatch 한다. */
@@ -113,10 +128,17 @@ sealed interface MainReducerEvent : ReducerEvent {
 
     data object DeleteDismissed : MainReducerEvent
 
-    data object Deleting : MainReducerEvent
+    data class Deleting(
+        val operation: DeleteOperation,
+    ) : MainReducerEvent
+
+    data class DeleteFailed(
+        val operation: DeleteOperation,
+        val error: AppError,
+    ) : MainReducerEvent
 
     data class Deleted(
-        val scheduleId: String,
+        val operation: DeleteOperation,
         val nowMillis: Long,
     ) : MainReducerEvent
 
@@ -141,4 +163,8 @@ sealed interface MainReducerEvent : ReducerEvent {
     data object ExactAlarmSettingsRequested : MainReducerEvent
 
     data object ExactAlarmSettingsRequestConsumed : MainReducerEvent
+
+    data object ExactAlarmSettingsFailed : MainReducerEvent
+
+    data object UserMessageConsumed : MainReducerEvent
 }
diff --git a/feature/main/src/main/java/com/example/slowclock/ui/main/MainScreen.kt b/feature/main/src/main/java/com/example/slowclock/ui/main/MainScreen.kt
index c5b556e2..88c1eab3 100644
--- a/feature/main/src/main/java/com/example/slowclock/ui/main/MainScreen.kt
+++ b/feature/main/src/main/java/com/example/slowclock/ui/main/MainScreen.kt
@@ -1,6 +1,7 @@
 package com.example.slowclock.ui.main
 
 import android.content.Intent
+import android.provider.Settings
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.PaddingValues
@@ -19,6 +20,8 @@ import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
 import androidx.compose.material3.TopAppBar
@@ -26,17 +29,21 @@ import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.dp
+import androidx.core.net.toUri
 import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.compose.LifecycleEventEffect
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.example.slowclock.ui.common.ScheduleLoadingIndicator
 import com.example.slowclock.ui.common.components.ErrorCard
 import com.example.slowclock.ui.common.components.SignInPrompt
 import com.example.slowclock.ui.common.components.rememberDayText
 import com.example.slowclock.ui.common.dialog.DeleteConfirmDialog
+import com.example.slowclock.ui.common.launchExternalActivity
 import com.example.slowclock.ui.main.components.DayHeader
 import com.example.slowclock.ui.main.components.EmptyStateCard
 import com.example.slowclock.ui.main.components.NowCard
@@ -44,6 +51,7 @@ import com.example.slowclock.ui.main.components.ScheduleDetailDialog
 import com.example.slowclock.ui.main.components.SharedRemindersSection
 import com.example.slowclock.ui.main.components.TodayScheduleSection
 import com.example.slowclock.ui.mvi.ObserveSignal
+import kotlinx.coroutines.launch
 import java.util.Date
 
 /** 메인 화면(stateful). 네비게이션 콜백만 받고 나머지는 [MainIntent] 로 보낸다. */
@@ -59,6 +67,13 @@ fun MainScreen(
 ) {
     val state by viewModel.uiState.collectAsStateWithLifecycle()
     val context = LocalContext.current
+    val snackbarHostState = remember { SnackbarHostState() }
+    val scope = rememberCoroutineScope()
+    ObserveSignal(
+        signal = state.userMessage,
+        consumed = MainIntent.ConsumeUserMessage,
+        onIntent = viewModel::onIntent,
+    ) { message -> scope.launch { snackbarHostState.showSnackbar(message) } }
     // 앱을 켜 둔 채 자정을 넘기면 구독이 어제 회차를 보고 있다(#171).
     LifecycleEventEffect(Lifecycle.Event.ON_RESUME) { viewModel.onIntent(MainIntent.ScreenResumed) }
     ObserveSignal(
@@ -66,7 +81,16 @@ fun MainScreen(
         consumed = MainIntent.ConsumeExactAlarmSettingsRequest,
         onIntent = viewModel::onIntent,
     ) {
-        context.startActivity(Intent(android.provider.Settings.ACTION_REQUEST_SCHEDULE_EXACT_ALARM))
+        val opened =
+            launchExternalActivity(
+                open = {
+                    context.startActivity(Intent(Settings.ACTION_REQUEST_SCHEDULE_EXACT_ALARM, "package:${context.packageName}".toUri()))
+                },
+                fallback = {
+                    context.startActivity(Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS, "package:${context.packageName}".toUri()))
+                },
+            )
+        if (!opened) viewModel.onIntent(MainIntent.ExactAlarmSettingsUnavailable)
     }
     MainContent(
         state = state,
@@ -76,6 +100,7 @@ fun MainScreen(
         onNavigateToProfile = onNavigateToProfile,
         onNavigateToSettings = onNavigateToSettings,
         onSignIn = onSignIn,
+        snackbarHost = { SnackbarHost(snackbarHostState) },
         modifier = modifier,
     )
 }
@@ -100,6 +125,7 @@ internal fun MainContent(
     // 날짜 머리글의 기준이 되는 날. 미리보기와 스크린샷 테스트는 고정된 날을 넣어, 그린 날에
     // 따라 그림이 달라지지 않게 한다. 시계를 읽으면 baseline 이 하루 만에 어긋난다(#143).
     today: Date = Date(),
+    snackbarHost: @Composable () -> Unit = {},
 ) {
     val isSignedOut = state.isSignedInKnown && state.currentUserId.isBlank()
     val dateText = rememberDayText(today)
@@ -142,6 +168,7 @@ internal fun MainContent(
 
     Scaffold(
         modifier = modifier,
+        snackbarHost = snackbarHost,
         containerColor = MaterialTheme.colorScheme.background,
         topBar = {
             TopAppBar(
@@ -244,7 +271,15 @@ internal fun MainContent(
                 }
             }
 
-            if (state.todaySchedules.isEmpty() && !state.isLoading) {
+            if (!state.isSignedInKnown || state.isLoading) {
+                item { ScheduleLoadingIndicator() }
+            }
+            if (state.pendingDelete != null) {
+                item { ScheduleLoadingIndicator(message = "일정을 삭제하고 있습니다") }
+            }
+            if (state.isSignedInKnown && state.todaySchedules.isEmpty() && !state.isLoading && state.error == null &&
+                state.pendingDelete == null
+            ) {
                 item { EmptyStateCard() }
             }
 
diff --git a/feature/main/src/main/java/com/example/slowclock/ui/main/MainViewModel.kt b/feature/main/src/main/java/com/example/slowclock/ui/main/MainViewModel.kt
index b21eb0cc..98f247d1 100644
--- a/feature/main/src/main/java/com/example/slowclock/ui/main/MainViewModel.kt
+++ b/feature/main/src/main/java/com/example/slowclock/ui/main/MainViewModel.kt
@@ -23,6 +23,7 @@ import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.launch
 import java.util.Calendar
 import java.util.Date
+import java.util.UUID
 import javax.inject.Inject
 
 /**
@@ -42,6 +43,7 @@ class MainViewModel
         private val alarmScheduler: AlarmScheduler,
     ) : MviViewModel<MainIntent, MainUiState, MainReducerEvent>(MainUiState()) {
         private var scheduleJob: Job? = null
+        private var deleteJob: Job? = null
 
         /** 지금 구독이 보고 있는 날. 날이 바뀌면 다시 건다(#171). */
         private var subscribedDay: String = ""
@@ -69,9 +71,17 @@ class MainViewModel
                 }
 
                 MainIntent.Retry -> {
+                    if (!currentState.canRetry) return
+                    val failedDelete = currentState.failedDelete
                     dispatch(MainReducerEvent.ErrorConsumed)
-                    observeTodaySchedules()
-                    authRepository.currentUid?.let(::syncAlarms)
+                    if (failedDelete != null) {
+                        if (failedDelete.userId == currentState.currentUserId) {
+                            deleteSchedule(failedDelete.schedule)
+                        }
+                    } else {
+                        observeTodaySchedules()
+                        authRepository.currentUid?.let(::syncAlarms)
+                    }
                 }
 
                 is MainIntent.ToggleComplete -> {
@@ -89,6 +99,7 @@ class MainViewModel
                 }
 
                 is MainIntent.RequestDelete -> {
+                    if (currentState.pendingDelete != null) return
                     currentState.todaySchedules
                         .find { it.id == intent.scheduleId }
                         ?.let { dispatch(MainReducerEvent.DeleteRequested(it)) }
@@ -99,7 +110,7 @@ class MainViewModel
                 }
 
                 MainIntent.ConfirmDelete -> {
-                    deleteSchedule()
+                    currentState.scheduleToDelete?.let(::deleteSchedule)
                 }
 
                 is MainIntent.ToggleSharedReminderComplete -> {
@@ -123,6 +134,14 @@ class MainViewModel
                 MainIntent.ConsumeExactAlarmSettingsRequest -> {
                     dispatch(MainReducerEvent.ExactAlarmSettingsRequestConsumed)
                 }
+
+                MainIntent.ExactAlarmSettingsUnavailable -> {
+                    dispatch(MainReducerEvent.ExactAlarmSettingsFailed)
+                }
+
+                MainIntent.ConsumeUserMessage -> {
+                    dispatch(MainReducerEvent.UserMessageConsumed)
+                }
             }
         }
 
@@ -132,7 +151,17 @@ class MainViewModel
         ): MainUiState =
             when (event) {
                 is MainReducerEvent.UserResolved -> {
-                    state.copy(currentUserId = event.userId, isSignedInKnown = true)
+                    if (state.currentUserId != event.userId) {
+                        // 직접 계정 전환에도 이전 계정의 삭제·재시도와 목록을 넘기지 않는다.
+                        MainUiState(
+                            currentUserId = event.userId,
+                            isSignedInKnown = true,
+                            showExactAlarmNotice = state.showExactAlarmNotice,
+                            openExactAlarmSettings = state.openExactAlarmSettings,
+                        )
+                    } else {
+                        state.copy(isSignedInKnown = true)
+                    }
                 }
 
                 MainReducerEvent.SignedOut -> {
@@ -150,19 +179,29 @@ class MainViewModel
                         canRetry = false,
                         selectedScheduleForDetail = null,
                         scheduleToDelete = null,
+                        pendingDelete = null,
+                        failedDelete = null,
                     )
                 }
 
                 MainReducerEvent.Loading -> {
-                    state.copy(isLoading = true, error = null, canRetry = false)
+                    state.copy(
+                        isLoading = true,
+                        error = if (state.failedDelete != null) state.error else null,
+                        canRetry = state.failedDelete != null,
+                    )
                 }
 
                 is MainReducerEvent.SchedulesLoaded -> {
-                    state.withSchedules(event.schedules, event.nowMillis).copy(isLoading = false, error = null)
+                    state.withSchedules(event.schedules, event.nowMillis).copy(
+                        isLoading = false,
+                        error = if (state.failedDelete != null) state.error else null,
+                        canRetry = state.failedDelete != null,
+                    )
                 }
 
                 is MainReducerEvent.LoadFailed -> {
-                    state.copy(isLoading = false, error = event.error, canRetry = event.canRetry)
+                    state.copy(isLoading = false, error = event.error, canRetry = event.canRetry, failedDelete = null)
                 }
 
                 is MainReducerEvent.CompletionToggled -> {
@@ -188,14 +227,32 @@ class MainViewModel
                     state.copy(scheduleToDelete = null)
                 }
 
-                MainReducerEvent.Deleting -> {
-                    state.copy(isLoading = true, error = null, scheduleToDelete = null)
+                is MainReducerEvent.Deleting -> {
+                    state.copy(
+                        error = null,
+                        canRetry = false,
+                        scheduleToDelete = null,
+                        pendingDelete = event.operation,
+                        failedDelete = null,
+                    )
+                }
+
+                is MainReducerEvent.DeleteFailed -> {
+                    if (state.pendingDelete == event.operation) {
+                        state.copy(pendingDelete = null, failedDelete = event.operation, error = event.error, canRetry = true)
+                    } else {
+                        state
+                    }
                 }
 
                 is MainReducerEvent.Deleted -> {
-                    state
-                        .withSchedules(state.todaySchedules.filter { it.id != event.scheduleId }, event.nowMillis)
-                        .copy(isLoading = false)
+                    if (state.pendingDelete == event.operation) {
+                        state
+                            .withSchedules(state.todaySchedules.filter { it.id != event.operation.schedule.id }, event.nowMillis)
+                            .copy(pendingDelete = null)
+                    } else {
+                        state
+                    }
                 }
 
                 is MainReducerEvent.SharedRemindersLoaded -> {
@@ -216,7 +273,7 @@ class MainViewModel
                 }
 
                 MainReducerEvent.ErrorConsumed -> {
-                    state.copy(error = null, canRetry = false)
+                    state.copy(error = null, canRetry = false, failedDelete = null)
                 }
 
                 MainReducerEvent.ExactAlarmNoticeShown -> {
@@ -234,6 +291,16 @@ class MainViewModel
                 MainReducerEvent.ExactAlarmSettingsRequestConsumed -> {
                     state.copy(openExactAlarmSettings = null)
                 }
+
+                MainReducerEvent.ExactAlarmSettingsFailed -> {
+                    state.copy(
+                        userMessage = "설정 화면을 열 수 없습니다. 기기 설정에서 느린 시계의 알람 권한을 확인해주세요",
+                    )
+                }
+
+                MainReducerEvent.UserMessageConsumed -> {
+                    state.copy(userMessage = null)
+                }
             }
 
         private fun MainUiState.withSchedules(
@@ -262,6 +329,8 @@ class MainViewModel
                     alarmSyncJob?.cancel()
                     alarmSyncJob = null
                     alarmSyncedFor = null
+                    deleteJob?.cancel()
+                    deleteJob = null
                     dispatch(MainReducerEvent.UserResolved(uid.orEmpty()))
                     if (uid != null) {
                         observeTodaySchedules()
@@ -392,22 +461,28 @@ class MainViewModel
             }
         }
 
-        private fun deleteSchedule() {
-            val schedule = currentState.scheduleToDelete ?: return
-            dispatch(MainReducerEvent.Deleting)
-            viewModelScope.launch {
-                when (val result = scheduleRepository.deleteSchedule(schedule.id)) {
-                    is ScheduleRepository.ScheduleResult.Success -> {
-                        runCatching { alarmScheduler.cancel(schedule) }.onFailure { Log.e(TAG, "알람 취소 실패", it) }
-                        dispatch(MainReducerEvent.Deleted(schedule.id, System.currentTimeMillis()))
-                    }
+        private fun deleteSchedule(schedule: Schedule) {
+            val uid = currentState.currentUserId
+            if (uid.isBlank() || authRepository.currentUid != uid || currentState.pendingDelete != null) return
+            val operation = DeleteOperation(schedule, uid, UUID.randomUUID().toString())
+            dispatch(MainReducerEvent.Deleting(operation))
+            deleteJob =
+                viewModelScope.launch {
+                    val result = scheduleRepository.deleteSchedule(schedule.id)
+                    currentCoroutineContext().ensureActive()
+                    if (currentState.pendingDelete != operation || authRepository.currentUid != uid) return@launch
+                    when (result) {
+                        is ScheduleRepository.ScheduleResult.Success -> {
+                            runCatching { alarmScheduler.cancel(schedule) }.onFailure { Log.e(TAG, "알람 취소 실패", it) }
+                            dispatch(MainReducerEvent.Deleted(operation, System.currentTimeMillis()))
+                        }
 
-                    is ScheduleRepository.ScheduleResult.Error -> {
-                        Log.e(TAG, "일정 삭제 실패: ${result.error.message}")
-                        dispatch(MainReducerEvent.LoadFailed(result.error, canRetry = true))
+                        is ScheduleRepository.ScheduleResult.Error -> {
+                            Log.e(TAG, "일정 삭제 실패: ${result.error.message}")
+                            dispatch(MainReducerEvent.DeleteFailed(operation, result.error))
+                        }
                     }
                 }
-            }
         }
 
         private fun toggleSharedReminderComplete(scheduleId: String) {
diff --git a/feature/main/src/main/java/com/example/slowclock/ui/main/components/ScheduleDetailDialog.kt b/feature/main/src/main/java/com/example/slowclock/ui/main/components/ScheduleDetailDialog.kt
index 477224b1..0e58cec3 100644
--- a/feature/main/src/main/java/com/example/slowclock/ui/main/components/ScheduleDetailDialog.kt
+++ b/feature/main/src/main/java/com/example/slowclock/ui/main/components/ScheduleDetailDialog.kt
@@ -1,8 +1,10 @@
 // app/src/main/java/com/example/slowclock/ui/main/components/ScheduleDetailDialog.kt
 package com.example.slowclock.ui.main.components
 
+import androidx.compose.foundation.ScrollState
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.FlowRow
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -10,6 +12,9 @@ import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.Notes
 import androidx.compose.material.icons.filled.AccessTime
@@ -28,6 +33,7 @@ import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.window.Dialog
 import com.example.slowclock.data.model.Schedule
@@ -40,230 +46,245 @@ fun ScheduleDetailDialog(
     onDismiss: () -> Unit,
     onEdit: () -> Unit = {}, // 새로 추가
     onDelete: () -> Unit = {}, // 새로 추가
+) {
+    Dialog(onDismissRequest = onDismiss) {
+        ScheduleDetailContent(schedule = schedule, onDismiss = onDismiss, onEdit = onEdit, onDelete = onDelete)
+    }
+}
+
+/** Dialog 또는 프리뷰의 유한한 높이 안에서 모든 내용과 액션에 스크롤로 닿는다. */
+@Composable
+internal fun ScheduleDetailContent(
+    schedule: Schedule,
+    onDismiss: () -> Unit,
+    onEdit: () -> Unit,
+    onDelete: () -> Unit,
+    modifier: Modifier = Modifier,
+    scrollState: ScrollState = rememberScrollState(),
 ) {
     val timeFormat = SimpleDateFormat("a h:mm", Locale.KOREAN)
     val dateFormat = SimpleDateFormat("M월 d일", Locale.KOREAN)
+    val actionMinWidth = 96.dp * LocalDensity.current.fontScale
 
-    Dialog(onDismissRequest = onDismiss) {
-        Card(
-            modifier =
-                Modifier
-                    .fillMaxWidth()
-                    .padding(20.dp),
-            colors = CardDefaults.cardColors(containerColor = MaterialTheme.colorScheme.surface),
-            shape = MaterialTheme.shapes.large,
-            elevation = CardDefaults.cardElevation(defaultElevation = 0.dp),
+    Card(
+        modifier =
+            modifier
+                .fillMaxWidth()
+                .padding(20.dp),
+        colors = CardDefaults.cardColors(containerColor = MaterialTheme.colorScheme.surface),
+        shape = MaterialTheme.shapes.large,
+        elevation = CardDefaults.cardElevation(defaultElevation = 0.dp),
+    ) {
+        Column(
+            modifier = Modifier.verticalScroll(scrollState).padding(28.dp),
         ) {
-            Column(
-                modifier = Modifier.padding(28.dp),
+            // 헤더 (제목 + 닫기 버튼)
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.SpaceBetween,
+                verticalAlignment = Alignment.CenterVertically,
             ) {
-                // 헤더 (제목 + 닫기 버튼)
-                Row(
-                    modifier = Modifier.fillMaxWidth(),
-                    horizontalArrangement = Arrangement.SpaceBetween,
-                    verticalAlignment = Alignment.CenterVertically,
-                ) {
+                Text(
+                    text = "일정 상세",
+                    style = MaterialTheme.typography.titleLarge,
+                    color = MaterialTheme.colorScheme.primary,
+                )
+                IconButton(onClick = onDismiss) {
+                    Icon(
+                        Icons.Default.Close,
+                        contentDescription = "닫기",
+                        tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                        modifier = Modifier.size(24.dp),
+                    )
+                }
+            }
+
+            Spacer(modifier = Modifier.height(20.dp))
+
+            // 제목 (크게)
+            Text(
+                text = schedule.title,
+                style = MaterialTheme.typography.headlineSmall,
+                color = MaterialTheme.colorScheme.onSurface,
+            )
+
+            Spacer(modifier = Modifier.height(24.dp))
+
+            // 시간 정보
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+            ) {
+                Icon(
+                    Icons.Default.AccessTime,
+                    contentDescription = null,
+                    tint = MaterialTheme.colorScheme.primary,
+                    modifier = Modifier.size(24.dp),
+                )
+                Spacer(modifier = Modifier.width(12.dp))
+                Column {
                     Text(
-                        text = "일정 상세",
-                        style = MaterialTheme.typography.titleLarge,
-                        color = MaterialTheme.colorScheme.primary,
+                        text = "${dateFormat.format(schedule.startTime.toDate())} ${
+                            timeFormat.format(
+                                schedule.startTime.toDate(),
+                            )
+                        }",
+                        style = MaterialTheme.typography.bodyLarge,
+                        color = MaterialTheme.colorScheme.onSurface,
                     )
-                    IconButton(onClick = onDismiss) {
-                        Icon(
-                            Icons.Default.Close,
-                            contentDescription = "닫기",
-                            tint = MaterialTheme.colorScheme.onSurfaceVariant,
-                            modifier = Modifier.size(24.dp),
+                    schedule.endTime?.let { endTime ->
+                        Text(
+                            text = "~ ${timeFormat.format(endTime.toDate())}",
+                            style = MaterialTheme.typography.bodyMedium,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
                         )
                     }
                 }
+            }
 
+            // 설명 (있을 때만)
+            if (schedule.description.isNotBlank()) {
                 Spacer(modifier = Modifier.height(20.dp))
-
-                // 제목 (크게)
-                Text(
-                    text = schedule.title,
-                    style = MaterialTheme.typography.headlineSmall,
-                    color = MaterialTheme.colorScheme.onSurface,
-                )
-
-                Spacer(modifier = Modifier.height(24.dp))
-
-                // 시간 정보
                 Row(
-                    verticalAlignment = Alignment.CenterVertically,
+                    verticalAlignment = Alignment.Top,
                 ) {
                     Icon(
-                        Icons.Default.AccessTime,
+                        Icons.AutoMirrored.Filled.Notes,
                         contentDescription = null,
-                        tint = MaterialTheme.colorScheme.primary,
+                        tint = MaterialTheme.colorScheme.secondary,
                         modifier = Modifier.size(24.dp),
                     )
                     Spacer(modifier = Modifier.width(12.dp))
                     Column {
                         Text(
-                            text = "${dateFormat.format(schedule.startTime.toDate())} ${
-                                timeFormat.format(
-                                    schedule.startTime.toDate(),
-                                )
-                            }",
-                            style = MaterialTheme.typography.bodyLarge,
-                            color = MaterialTheme.colorScheme.onSurface,
-                        )
-                        schedule.endTime?.let { endTime ->
-                            Text(
-                                text = "~ ${timeFormat.format(endTime.toDate())}",
-                                style = MaterialTheme.typography.bodyMedium,
-                                color = MaterialTheme.colorScheme.onSurfaceVariant,
-                            )
-                        }
-                    }
-                }
-
-                // 설명 (있을 때만)
-                if (schedule.description.isNotBlank()) {
-                    Spacer(modifier = Modifier.height(20.dp))
-                    Row(
-                        verticalAlignment = Alignment.Top,
-                    ) {
-                        Icon(
-                            Icons.AutoMirrored.Filled.Notes,
-                            contentDescription = null,
-                            tint = MaterialTheme.colorScheme.secondary,
-                            modifier = Modifier.size(24.dp),
+                            text = "상세 내용",
+                            style = MaterialTheme.typography.bodyMedium,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
                         )
-                        Spacer(modifier = Modifier.width(12.dp))
-                        Column {
-                            Text(
-                                text = "상세 내용",
-                                style = MaterialTheme.typography.bodyMedium,
-                                color = MaterialTheme.colorScheme.onSurfaceVariant,
-                            )
-                            Spacer(modifier = Modifier.height(8.dp))
-                            Text(
-                                text = schedule.description,
-                                style = MaterialTheme.typography.bodyLarge,
-                                color = MaterialTheme.colorScheme.onSurface,
-                                lineHeight = MaterialTheme.typography.bodyLarge.lineHeight,
-                            )
-                        }
-                    }
-                }
-
-                // 반복 일정 정보 (있을 때만)
-                if (schedule.recurring) {
-                    Spacer(modifier = Modifier.height(20.dp))
-                    Row(
-                        verticalAlignment = Alignment.CenterVertically,
-                    ) {
-                        Icon(
-                            Icons.Default.Loop,
-                            contentDescription = null,
-                            tint = MaterialTheme.colorScheme.tertiary,
-                            modifier = Modifier.size(24.dp),
-                        )
-                        Spacer(modifier = Modifier.width(12.dp))
+                        Spacer(modifier = Modifier.height(8.dp))
                         Text(
-                            text =
-                                when (schedule.recurringType) {
-                                    "daily" -> "매일 반복"
-                                    "weekly" -> "매주 반복"
-                                    "monthly" -> "매월 반복"
-                                    else -> "반복 일정"
-                                },
+                            text = schedule.description,
                             style = MaterialTheme.typography.bodyLarge,
-                            color = MaterialTheme.colorScheme.tertiary,
+                            color = MaterialTheme.colorScheme.onSurface,
+                            lineHeight = MaterialTheme.typography.bodyLarge.lineHeight,
                         )
                     }
                 }
+            }
 
-                // 완료 상태
+            // 반복 일정 정보 (있을 때만)
+            if (schedule.recurring) {
                 Spacer(modifier = Modifier.height(20.dp))
                 Row(
                     verticalAlignment = Alignment.CenterVertically,
                 ) {
                     Icon(
-                        Icons.Default.CheckCircle,
+                        Icons.Default.Loop,
                         contentDescription = null,
-                        tint =
-                            if (schedule.completed) {
-                                MaterialTheme.colorScheme.secondary
-                            } else {
-                                MaterialTheme.colorScheme.onSurfaceVariant
-                            },
+                        tint = MaterialTheme.colorScheme.tertiary,
                         modifier = Modifier.size(24.dp),
                     )
                     Spacer(modifier = Modifier.width(12.dp))
                     Text(
-                        text = if (schedule.completed) "✅ 완료됨" else "⏳ 미완료",
-                        style = MaterialTheme.typography.bodyLarge,
-                        color =
-                            if (schedule.completed) {
-                                MaterialTheme.colorScheme.secondary
-                            } else {
-                                MaterialTheme.colorScheme.onSurfaceVariant
+                        text =
+                            when (schedule.recurringType) {
+                                "daily" -> "매일 반복"
+                                "weekly" -> "매주 반복"
+                                "monthly" -> "매월 반복"
+                                else -> "반복 일정"
                             },
+                        style = MaterialTheme.typography.bodyLarge,
+                        color = MaterialTheme.colorScheme.tertiary,
                     )
                 }
+            }
 
-                Spacer(modifier = Modifier.height(28.dp))
-
-                Row(
-                    modifier = Modifier.fillMaxWidth(),
-                    horizontalArrangement = Arrangement.spacedBy(12.dp),
-                ) {
-                    // 수정 버튼
-                    Button(
-                        onClick = {
-                            onEdit()
-                            onDismiss()
+            // 완료 상태
+            Spacer(modifier = Modifier.height(20.dp))
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+            ) {
+                Icon(
+                    Icons.Default.CheckCircle,
+                    contentDescription = null,
+                    tint =
+                        if (schedule.completed) {
+                            MaterialTheme.colorScheme.tertiary
+                        } else {
+                            MaterialTheme.colorScheme.onSurfaceVariant
                         },
-                        modifier = Modifier.weight(1f),
-                        colors =
-                            ButtonDefaults.buttonColors(
-                                containerColor = MaterialTheme.colorScheme.primary,
-                            ),
-                    ) {
-                        Text(
-                            "수정",
-                            style = MaterialTheme.typography.bodyLarge,
-                            color = MaterialTheme.colorScheme.onPrimary,
-                        )
-                    }
-
-                    // 삭제 버튼
-                    Button(
-                        onClick = {
-                            onDelete()
-                            onDismiss()
+                    modifier = Modifier.size(24.dp),
+                )
+                Spacer(modifier = Modifier.width(12.dp))
+                Text(
+                    text = if (schedule.completed) "완료됨" else "미완료",
+                    style = MaterialTheme.typography.bodyLarge,
+                    color =
+                        if (schedule.completed) {
+                            MaterialTheme.colorScheme.tertiary
+                        } else {
+                            MaterialTheme.colorScheme.onSurfaceVariant
                         },
-                        modifier = Modifier.weight(1f),
-                        colors =
-                            ButtonDefaults.buttonColors(
-                                containerColor = MaterialTheme.colorScheme.error,
-                            ),
-                    ) {
-                        Text(
-                            "삭제",
-                            style = MaterialTheme.typography.bodyLarge,
-                            color = MaterialTheme.colorScheme.onError,
-                        )
-                    }
-                }
+                )
+            }
 
-                Spacer(modifier = Modifier.height(12.dp))
+            Spacer(modifier = Modifier.height(28.dp))
 
-                // 닫기 버튼
-                TextButton(
-                    onClick = onDismiss,
-                    modifier = Modifier.fillMaxWidth(),
+            FlowRow(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.spacedBy(12.dp),
+                verticalArrangement = Arrangement.spacedBy(12.dp),
+            ) {
+                // 수정 버튼
+                Button(
+                    onClick = {
+                        onEdit()
+                        onDismiss()
+                    },
+                    modifier = Modifier.widthIn(min = actionMinWidth).weight(1f),
+                    colors =
+                        ButtonDefaults.buttonColors(
+                            containerColor = MaterialTheme.colorScheme.primary,
+                        ),
                 ) {
                     Text(
-                        text = "닫기",
+                        "수정",
                         style = MaterialTheme.typography.bodyLarge,
-                        color = MaterialTheme.colorScheme.onSurface, // 색상 명시
+                        color = MaterialTheme.colorScheme.onPrimary,
                     )
                 }
+
+                // 삭제 버튼
+                Button(
+                    onClick = {
+                        onDelete()
+                        onDismiss()
+                    },
+                    modifier = Modifier.widthIn(min = actionMinWidth).weight(1f),
+                    colors =
+                        ButtonDefaults.buttonColors(
+                            containerColor = MaterialTheme.colorScheme.error,
+                        ),
+                ) {
+                    Text(
+                        "삭제",
+                        style = MaterialTheme.typography.bodyLarge,
+                        color = MaterialTheme.colorScheme.onError,
+                    )
+                }
+            }
+
+            Spacer(modifier = Modifier.height(12.dp))
+
+            // 닫기 버튼
+            TextButton(
+                onClick = onDismiss,
+                modifier = Modifier.fillMaxWidth(),
+            ) {
+                Text(
+                    text = "닫기",
+                    style = MaterialTheme.typography.bodyLarge,
+                    color = MaterialTheme.colorScheme.onSurface, // 색상 명시
+                )
             }
         }
     }
diff --git a/feature/main/src/main/java/com/example/slowclock/ui/settings/SettingsContract.kt b/feature/main/src/main/java/com/example/slowclock/ui/settings/SettingsContract.kt
index e438579f..3c1dee62 100644
--- a/feature/main/src/main/java/com/example/slowclock/ui/settings/SettingsContract.kt
+++ b/feature/main/src/main/java/com/example/slowclock/ui/settings/SettingsContract.kt
@@ -4,6 +4,7 @@ import com.example.slowclock.data.model.ThemeMode
 import com.example.slowclock.ui.mvi.MviIntent
 import com.example.slowclock.ui.mvi.ReducerEvent
 import com.example.slowclock.ui.mvi.UiState
+import com.example.slowclock.util.AppError
 
 /** 정보 화면에서 사용자가 하려는 것. */
 sealed interface SettingsIntent : MviIntent {
@@ -18,6 +19,14 @@ sealed interface SettingsIntent : MviIntent {
     data object OpenFullScreenAlarmSettings : SettingsIntent
 
     data object ConsumeFullScreenAlarmSettingsRequest : SettingsIntent
+
+    data object OpenMedicalNews : SettingsIntent
+
+    data object ConsumeMedicalNewsRequest : SettingsIntent
+
+    data object MedicalNewsUnavailable : SettingsIntent
+
+    data object ConsumeError : SettingsIntent
 }
 
 /** 정보 화면의 단일 UI 상태. */
@@ -27,6 +36,8 @@ data class SettingsUiState(
     val showFullScreenAlarmNotice: Boolean = false,
     /** null 이 아니면 화면이 시스템 설정을 한 번 연다. */
     val openFullScreenAlarmSettings: Unit? = null,
+    val openMedicalNews: Unit? = null,
+    val error: AppError? = null,
 ) : UiState
 
 /** 정보 화면의 상태가 겪은 것. */
@@ -42,4 +53,12 @@ sealed interface SettingsReducerEvent : ReducerEvent {
     data object FullScreenAlarmSettingsRequested : SettingsReducerEvent
 
     data object FullScreenAlarmSettingsRequestConsumed : SettingsReducerEvent
+
+    data object MedicalNewsRequested : SettingsReducerEvent
+
+    data object MedicalNewsRequestConsumed : SettingsReducerEvent
+
+    data object MedicalNewsFailed : SettingsReducerEvent
+
+    data object ErrorConsumed : SettingsReducerEvent
 }
diff --git a/feature/main/src/main/java/com/example/slowclock/ui/settings/SettingsScreen.kt b/feature/main/src/main/java/com/example/slowclock/ui/settings/SettingsScreen.kt
index dd5983fe..b01cad14 100644
--- a/feature/main/src/main/java/com/example/slowclock/ui/settings/SettingsScreen.kt
+++ b/feature/main/src/main/java/com/example/slowclock/ui/settings/SettingsScreen.kt
@@ -43,7 +43,9 @@ import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.compose.LifecycleEventEffect
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.example.slowclock.data.model.ThemeMode
+import com.example.slowclock.ui.common.components.ErrorCard
 import com.example.slowclock.ui.common.components.ScreenHeader
+import com.example.slowclock.ui.common.launchExternalActivity
 import com.example.slowclock.ui.mvi.ObserveSignal
 
 /** 메디컬타임즈 의료 뉴스 목록. 기사는 앱이 읽거나 저장하지 않고 브라우저로만 연다. */
@@ -69,6 +71,15 @@ fun SettingsScreen(
     ) {
         context.openFullScreenAlarmSettings()
     }
+    ObserveSignal(
+        signal = state.openMedicalNews,
+        consumed = SettingsIntent.ConsumeMedicalNewsRequest,
+        onIntent = viewModel::onIntent,
+    ) {
+        if (!launchExternalActivity(open = { context.startActivity(Intent(Intent.ACTION_VIEW, MEDICAL_NEWS_URL.toUri())) })) {
+            viewModel.onIntent(SettingsIntent.MedicalNewsUnavailable)
+        }
+    }
     SettingsContent(state = state, onIntent = viewModel::onIntent, modifier = modifier)
 }
 
@@ -116,7 +127,10 @@ internal fun SettingsContent(
             FullScreenAlarmCard(onOpenSettings = { onIntent(SettingsIntent.OpenFullScreenAlarmSettings) })
         }
         ThemeModeCard(selected = state.themeMode, onSelect = { onIntent(SettingsIntent.SelectThemeMode(it)) })
-        MedicalNewsCard()
+        state.error?.let { error ->
+            ErrorCard(error = error, canRetry = false, onDismiss = { onIntent(SettingsIntent.ConsumeError) })
+        }
+        MedicalNewsCard(onOpen = { onIntent(SettingsIntent.OpenMedicalNews) })
     }
 }
 
@@ -240,15 +254,15 @@ private fun FullScreenAlarmCard(
 }
 
 @Composable
-private fun MedicalNewsCard(modifier: Modifier = Modifier) {
-    val context = LocalContext.current
+private fun MedicalNewsCard(
+    onOpen: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
     Card(
         modifier =
             modifier
                 .fillMaxWidth()
-                .clickable {
-                    context.startActivity(Intent(Intent.ACTION_VIEW, MEDICAL_NEWS_URL.toUri()))
-                },
+                .clickable(onClick = onOpen),
         shape = MaterialTheme.shapes.medium,
         colors = CardDefaults.cardColors(containerColor = MaterialTheme.colorScheme.surfaceContainer),
         elevation = CardDefaults.cardElevation(defaultElevation = 0.dp),
diff --git a/feature/main/src/main/java/com/example/slowclock/ui/settings/SettingsViewModel.kt b/feature/main/src/main/java/com/example/slowclock/ui/settings/SettingsViewModel.kt
index a6e777cb..f8a1d858 100644
--- a/feature/main/src/main/java/com/example/slowclock/ui/settings/SettingsViewModel.kt
+++ b/feature/main/src/main/java/com/example/slowclock/ui/settings/SettingsViewModel.kt
@@ -4,6 +4,7 @@ import androidx.lifecycle.viewModelScope
 import com.example.slowclock.core.alarm.AlarmScheduler
 import com.example.slowclock.data.remote.repository.SettingsRepository
 import com.example.slowclock.ui.mvi.MviViewModel
+import com.example.slowclock.util.AppError
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.launch
 import javax.inject.Inject
@@ -45,6 +46,22 @@ class SettingsViewModel
                 SettingsIntent.ConsumeFullScreenAlarmSettingsRequest -> {
                     dispatch(SettingsReducerEvent.FullScreenAlarmSettingsRequestConsumed)
                 }
+
+                SettingsIntent.OpenMedicalNews -> {
+                    dispatch(SettingsReducerEvent.MedicalNewsRequested)
+                }
+
+                SettingsIntent.ConsumeMedicalNewsRequest -> {
+                    dispatch(SettingsReducerEvent.MedicalNewsRequestConsumed)
+                }
+
+                SettingsIntent.MedicalNewsUnavailable -> {
+                    dispatch(SettingsReducerEvent.MedicalNewsFailed)
+                }
+
+                SettingsIntent.ConsumeError -> {
+                    dispatch(SettingsReducerEvent.ErrorConsumed)
+                }
             }
         }
 
@@ -78,5 +95,23 @@ class SettingsViewModel
                 SettingsReducerEvent.FullScreenAlarmSettingsRequestConsumed -> {
                     state.copy(openFullScreenAlarmSettings = null)
                 }
+
+                SettingsReducerEvent.MedicalNewsRequested -> {
+                    state.copy(openMedicalNews = Unit, error = null)
+                }
+
+                SettingsReducerEvent.MedicalNewsRequestConsumed -> {
+                    state.copy(openMedicalNews = null)
+                }
+
+                SettingsReducerEvent.MedicalNewsFailed -> {
+                    state.copy(
+                        error = AppError.GeneralError("브라우저를 열 수 없습니다. 기기에 브라우저가 설치되어 있고 사용 가능한지 확인해주세요"),
+                    )
+                }
+
+                SettingsReducerEvent.ErrorConsumed -> {
+                    state.copy(error = null)
+                }
             }
     }
diff --git a/feature/main/src/main/java/com/example/slowclock/ui/timeline/DaySwipeGesture.kt b/feature/main/src/main/java/com/example/slowclock/ui/timeline/DaySwipeGesture.kt
new file mode 100644
index 00000000..c0e0cbc9
--- /dev/null
+++ b/feature/main/src/main/java/com/example/slowclock/ui/timeline/DaySwipeGesture.kt
@@ -0,0 +1,27 @@
+package com.example.slowclock.ui.timeline
+
+/** 한 번의 드래그에서 이동량을 누적하고 날짜 이동은 한 번만 낸다. */
+internal class DaySwipeGesture(
+    private val threshold: Float,
+) {
+    private var distance = 0f
+    private var handled = false
+
+    fun reset() {
+        distance = 0f
+        handled = false
+    }
+
+    fun dragBy(delta: Float): TimelineIntent? {
+        if (handled) return null
+        distance += delta
+        val intent =
+            when {
+                distance > threshold -> TimelineIntent.PreviousDay
+                distance < -threshold -> TimelineIntent.NextDay
+                else -> return null
+            }
+        handled = true
+        return intent
+    }
+}
diff --git a/feature/main/src/main/java/com/example/slowclock/ui/timeline/TimelineScreen.kt b/feature/main/src/main/java/com/example/slowclock/ui/timeline/TimelineScreen.kt
index 2427e3b8..1639bfb0 100644
--- a/feature/main/src/main/java/com/example/slowclock/ui/timeline/TimelineScreen.kt
+++ b/feature/main/src/main/java/com/example/slowclock/ui/timeline/TimelineScreen.kt
@@ -24,6 +24,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberUpdatedState
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -32,6 +33,7 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.dp
 import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.example.slowclock.ui.common.ScheduleLoadingIndicator
 import com.example.slowclock.ui.common.components.EmptyState
 import com.example.slowclock.ui.common.components.ErrorCard
 import com.example.slowclock.ui.common.components.ScreenHeader
@@ -63,7 +65,7 @@ internal fun TimelineContent(
     modifier: Modifier = Modifier,
 ) {
     val context = LocalContext.current
-    var hasSwiped by remember { mutableStateOf(false) }
+    val currentOnIntent by rememberUpdatedState(onIntent)
     val selectedDate = state.selectedDate
     val dayText = rememberDayText(selectedDate.time)
 
@@ -73,18 +75,13 @@ internal fun TimelineContent(
                 .fillMaxSize()
                 .padding(horizontal = 20.dp)
                 .pointerInput(Unit) {
+                    val gesture = DaySwipeGesture(SWIPE_THRESHOLD_PX)
                     detectHorizontalDragGestures(
-                        onDragStart = { hasSwiped = false },
+                        onDragStart = { gesture.reset() },
+                        onDragEnd = { gesture.reset() },
+                        onDragCancel = { gesture.reset() },
                     ) { _, dragAmount ->
-                        if (!hasSwiped) {
-                            if (dragAmount > SWIPE_THRESHOLD_PX) {
-                                onIntent(TimelineIntent.PreviousDay)
-                                hasSwiped = true
-                            } else if (dragAmount < -SWIPE_THRESHOLD_PX) {
-                                onIntent(TimelineIntent.NextDay)
-                                hasSwiped = true
-                            }
-                        }
+                        gesture.dragBy(dragAmount)?.let(currentOnIntent)
                     }
                 },
     ) {
@@ -106,7 +103,11 @@ internal fun TimelineContent(
             )
         }
 
+        if (state.isLoading) {
+            ScheduleLoadingIndicator()
+        }
         if (state.schedules.isEmpty()) {
+            if (state.isLoading || state.error != null) return@Column
             EmptyState(
                 icon = Icons.Outlined.Schedule,
                 title = "이 날은 일정이 없습니다",
diff --git a/feature/main/src/screenshotTest/java/com/example/slowclock/ui/LargeTextScreenshotTest.kt b/feature/main/src/screenshotTest/java/com/example/slowclock/ui/LargeTextScreenshotTest.kt
new file mode 100644
index 00000000..8d7d0eb3
--- /dev/null
+++ b/feature/main/src/screenshotTest/java/com/example/slowclock/ui/LargeTextScreenshotTest.kt
@@ -0,0 +1,34 @@
+package com.example.slowclock.ui
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.tooling.preview.Preview
+import com.android.tools.screenshot.PreviewTest
+import com.example.slowclock.ui.common.components.BottomNavigationBar
+import com.example.slowclock.ui.common.components.ScheduleRow
+import com.example.slowclock.ui.theme.SlowClockTheme
+import java.util.Calendar
+
+@PreviewTest
+@Preview(name = "일정 줄 큰 글자 320", widthDp = 320, heightDp = 240, fontScale = 2f)
+@Preview(name = "일정 줄 큰 글자 360", widthDp = 360, heightDp = 240, fontScale = 2f)
+@Composable
+internal fun ScheduleRowLargeTextScreenshot() {
+    SlowClockTheme(darkTheme = false) {
+        ScheduleRow(
+            time = Calendar.getInstance().apply { set(2026, Calendar.SEPTEMBER, 6, 11, 59, 0) }.time,
+            title = "혈압약 먹기",
+            completed = false,
+            onToggleComplete = {},
+        )
+    }
+}
+
+@PreviewTest
+@Preview(name = "하단 탭 큰 글자 320", widthDp = 320, heightDp = 160, fontScale = 2f)
+@Preview(name = "하단 탭 큰 글자 360", widthDp = 360, heightDp = 160, fontScale = 2f)
+@Composable
+internal fun BottomNavigationLargeTextScreenshot() {
+    SlowClockTheme(darkTheme = false) {
+        BottomNavigationBar(currentRoute = "timeline", onNavigate = {})
+    }
+}
diff --git a/feature/main/src/screenshotTest/java/com/example/slowclock/ui/RecoveryScreenshotTest.kt b/feature/main/src/screenshotTest/java/com/example/slowclock/ui/RecoveryScreenshotTest.kt
new file mode 100644
index 00000000..0ca2f0c7
--- /dev/null
+++ b/feature/main/src/screenshotTest/java/com/example/slowclock/ui/RecoveryScreenshotTest.kt
@@ -0,0 +1,140 @@
+package com.example.slowclock.ui
+
+import androidx.compose.foundation.ScrollState
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.tooling.preview.Preview
+import com.android.tools.screenshot.PreviewTest
+import com.example.slowclock.data.model.Schedule
+import com.example.slowclock.ui.common.components.ErrorCard
+import com.example.slowclock.ui.done.DoneContent
+import com.example.slowclock.ui.done.DoneUiState
+import com.example.slowclock.ui.main.MainContent
+import com.example.slowclock.ui.main.MainUiState
+import com.example.slowclock.ui.main.components.ScheduleDetailContent
+import com.example.slowclock.ui.theme.SlowClockTheme
+import com.example.slowclock.ui.timeline.TimelineContent
+import com.example.slowclock.ui.timeline.TimelineUiState
+import com.example.slowclock.util.AppError
+import com.google.firebase.Timestamp
+import java.util.Calendar
+
+private val recoveryDate =
+    Calendar.getInstance().apply {
+        set(2026, Calendar.SEPTEMBER, 6, 11, 59, 0)
+        set(Calendar.MILLISECOND, 0)
+    }
+
+@PreviewTest
+@Preview(name = "메인 로딩", widthDp = 320, heightDp = 600)
+@Composable
+internal fun MainLoadingScreenshot() = MainRecoveryPreview(MainUiState(isLoading = true))
+
+@PreviewTest
+@Preview(name = "메인 조회 오류", widthDp = 320, heightDp = 600)
+@Composable
+internal fun MainErrorScreenshot() = MainRecoveryPreview(MainUiState(error = AppError.NetworkError, canRetry = true))
+
+@Composable
+private fun MainRecoveryPreview(state: MainUiState) {
+    SlowClockTheme(darkTheme = false) {
+        MainContent(
+            state = state.copy(currentUserId = "uid-1", isSignedInKnown = true),
+            onIntent = {},
+            onAddSchedule = {},
+            onEditSchedule = {},
+            onNavigateToProfile = {},
+            onNavigateToSettings = {},
+            onSignIn = {},
+            today = recoveryDate.time,
+        )
+    }
+}
+
+@PreviewTest
+@Preview(name = "완료 로딩", widthDp = 320, heightDp = 420)
+@Composable
+internal fun DoneLoadingScreenshot() {
+    SlowClockTheme(darkTheme = false) {
+        DoneContent(state = DoneUiState(isLoading = true), onIntent = {}, today = recoveryDate.time)
+    }
+}
+
+@PreviewTest
+@Preview(name = "완료 조회 오류", widthDp = 320, heightDp = 600)
+@Composable
+internal fun DoneErrorScreenshot() {
+    SlowClockTheme(darkTheme = false) {
+        DoneContent(state = DoneUiState(error = AppError.NetworkError), onIntent = {}, today = recoveryDate.time)
+    }
+}
+
+@PreviewTest
+@Preview(name = "시간표 로딩", widthDp = 360, heightDp = 420)
+@Composable
+internal fun TimelineLoadingScreenshot() {
+    SlowClockTheme(darkTheme = false) {
+        TimelineContent(state = TimelineUiState(selectedDate = recoveryDate, isLoading = true), onIntent = {})
+    }
+}
+
+@PreviewTest
+@Preview(name = "시간표 조회 오류", widthDp = 360, heightDp = 600)
+@Composable
+internal fun TimelineErrorScreenshot() {
+    SlowClockTheme(darkTheme = false) {
+        TimelineContent(state = TimelineUiState(selectedDate = recoveryDate, error = AppError.NetworkError), onIntent = {})
+    }
+}
+
+@PreviewTest
+@Preview(name = "재시도 없는 오류 닫기", widthDp = 320, heightDp = 400, fontScale = 2f)
+@Composable
+internal fun DismissErrorLargeTextScreenshot() {
+    SlowClockTheme(darkTheme = false) {
+        ErrorCard(error = AppError.PermissionError, canRetry = false, onDismiss = {})
+    }
+}
+
+private val longDetail =
+    Schedule(
+        id = "detail",
+        title = "혈압약 먹기",
+        description = List(20) { "식사 후 물과 함께 복용해주세요." }.joinToString("\n"),
+        startTime = Timestamp(recoveryDate.time),
+        completed = true,
+    )
+
+@PreviewTest
+@Preview(name = "오류 재시도 큰 글자", widthDp = 320, heightDp = 600, fontScale = 2f)
+@Composable
+internal fun RetryErrorLargeTextScreenshot() {
+    SlowClockTheme(darkTheme = false) {
+        ErrorCard(error = AppError.NetworkError, canRetry = true, onRetry = {}, onDismiss = {})
+    }
+}
+
+@PreviewTest
+@Preview(name = "상세 큰 글자 상단 320", widthDp = 320, heightDp = 640, fontScale = 2f)
+@Preview(name = "상세 큰 글자 상단 360", widthDp = 360, heightDp = 640, fontScale = 2f)
+@Composable
+internal fun DetailTopLargeTextScreenshot() {
+    SlowClockTheme(darkTheme = false) {
+        ScheduleDetailContent(schedule = longDetail, onDismiss = {}, onEdit = {}, onDelete = {})
+    }
+}
+
+@PreviewTest
+@Preview(name = "상세 큰 글자 하단 320", widthDp = 320, heightDp = 640, fontScale = 2f)
+@Preview(name = "상세 큰 글자 하단 360", widthDp = 360, heightDp = 640, fontScale = 2f)
+@Composable
+internal fun DetailBottomLargeTextScreenshot() {
+    SlowClockTheme(darkTheme = false) {
+        ScheduleDetailContent(
+            schedule = longDetail,
+            onDismiss = {},
+            onEdit = {},
+            onDelete = {},
+            scrollState = ScrollState(Int.MAX_VALUE),
+        )
+    }
+}
diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/LargeTextScreenshotTestKt/BottomNavigationLargeTextScreenshot_\355\225\230\353\213\250 \355\203\255 \355\201\260 \352\270\200\354\236\220 320_03a6813e_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/LargeTextScreenshotTestKt/BottomNavigationLargeTextScreenshot_\355\225\230\353\213\250 \355\203\255 \355\201\260 \352\270\200\354\236\220 320_03a6813e_0.png"
new file mode 100644
index 00000000..1d409c51
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/LargeTextScreenshotTestKt/BottomNavigationLargeTextScreenshot_\355\225\230\353\213\250 \355\203\255 \355\201\260 \352\270\200\354\236\220 360_729bee77_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/LargeTextScreenshotTestKt/BottomNavigationLargeTextScreenshot_\355\225\230\353\213\250 \355\203\255 \355\201\260 \352\270\200\354\236\220 360_729bee77_0.png"
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index 00000000..028fca28
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/LargeTextScreenshotTestKt/ScheduleRowLargeTextScreenshot_\354\235\274\354\240\225 \354\244\204 \355\201\260 \352\270\200\354\236\220 320_8b0ca01c_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/LargeTextScreenshotTestKt/ScheduleRowLargeTextScreenshot_\354\235\274\354\240\225 \354\244\204 \355\201\260 \352\270\200\354\236\220 320_8b0ca01c_0.png"
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/LargeTextScreenshotTestKt/ScheduleRowLargeTextScreenshot_\354\235\274\354\240\225 \354\244\204 \355\201\260 \352\270\200\354\236\220 360_e3a223a5_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/LargeTextScreenshotTestKt/ScheduleRowLargeTextScreenshot_\354\235\274\354\240\225 \354\244\204 \355\201\260 \352\270\200\354\236\220 360_e3a223a5_0.png"
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DetailBottomLargeTextScreenshot_\354\203\201\354\204\270 \355\201\260 \352\270\200\354\236\220 \355\225\230\353\213\250 320_c20cf7f1_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DetailBottomLargeTextScreenshot_\354\203\201\354\204\270 \355\201\260 \352\270\200\354\236\220 \355\225\230\353\213\250 320_c20cf7f1_0.png"
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index 00000000..1985499d
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DetailBottomLargeTextScreenshot_\354\203\201\354\204\270 \355\201\260 \352\270\200\354\236\220 \355\225\230\353\213\250 360_50c4da35_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DetailBottomLargeTextScreenshot_\354\203\201\354\204\270 \355\201\260 \352\270\200\354\236\220 \355\225\230\353\213\250 360_50c4da35_0.png"
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index 00000000..1b907b01
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DetailTopLargeTextScreenshot_\354\203\201\354\204\270 \355\201\260 \352\270\200\354\236\220 \354\203\201\353\213\250 320_3ccd4f46_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DetailTopLargeTextScreenshot_\354\203\201\354\204\270 \355\201\260 \352\270\200\354\236\220 \354\203\201\353\213\250 320_3ccd4f46_0.png"
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index 00000000..98b1ef53
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DetailTopLargeTextScreenshot_\354\203\201\354\204\270 \355\201\260 \352\270\200\354\236\220 \354\203\201\353\213\250 360_8f635f36_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DetailTopLargeTextScreenshot_\354\203\201\354\204\270 \355\201\260 \352\270\200\354\236\220 \354\203\201\353\213\250 360_8f635f36_0.png"
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DismissErrorLargeTextScreenshot_\354\236\254\354\213\234\353\217\204 \354\227\206\353\212\224 \354\230\244\353\245\230 \353\213\253\352\270\260_4350eab9_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DismissErrorLargeTextScreenshot_\354\236\254\354\213\234\353\217\204 \354\227\206\353\212\224 \354\230\244\353\245\230 \353\213\253\352\270\260_4350eab9_0.png"
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DoneErrorScreenshot_\354\231\204\353\243\214 \354\241\260\355\232\214 \354\230\244\353\245\230_f24b0917_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DoneErrorScreenshot_\354\231\204\353\243\214 \354\241\260\355\232\214 \354\230\244\353\245\230_f24b0917_0.png"
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DoneLoadingScreenshot_\354\231\204\353\243\214 \353\241\234\353\224\251_adc5e26a_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/DoneLoadingScreenshot_\354\231\204\353\243\214 \353\241\234\353\224\251_adc5e26a_0.png"
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/MainErrorScreenshot_\353\251\224\354\235\270 \354\241\260\355\232\214 \354\230\244\353\245\230_b1bbe94e_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/MainErrorScreenshot_\353\251\224\354\235\270 \354\241\260\355\232\214 \354\230\244\353\245\230_b1bbe94e_0.png"
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/MainLoadingScreenshot_\353\251\224\354\235\270 \353\241\234\353\224\251_bff103fd_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/MainLoadingScreenshot_\353\251\224\354\235\270 \353\241\234\353\224\251_bff103fd_0.png"
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/RetryErrorLargeTextScreenshot_\354\230\244\353\245\230 \354\236\254\354\213\234\353\217\204 \355\201\260 \352\270\200\354\236\220_d33ab22f_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/RetryErrorLargeTextScreenshot_\354\230\244\353\245\230 \354\236\254\354\213\234\353\217\204 \355\201\260 \352\270\200\354\236\220_d33ab22f_0.png"
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/TimelineErrorScreenshot_\354\213\234\352\260\204\355\221\234 \354\241\260\355\232\214 \354\230\244\353\245\230_2c012743_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/TimelineErrorScreenshot_\354\213\234\352\260\204\355\221\234 \354\241\260\355\232\214 \354\230\244\353\245\230_2c012743_0.png"
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diff --git "a/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/TimelineLoadingScreenshot_\354\213\234\352\260\204\355\221\234 \353\241\234\353\224\251_1cba0baf_0.png" "b/feature/main/src/screenshotTestDebug/reference/com/example/slowclock/ui/RecoveryScreenshotTestKt/TimelineLoadingScreenshot_\354\213\234\352\260\204\355\221\234 \353\241\234\353\224\251_1cba0baf_0.png"
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index 00000000..d0f603cc
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diff --git a/feature/main/src/test/java/com/example/slowclock/ui/common/ExternalActivityLauncherTest.kt b/feature/main/src/test/java/com/example/slowclock/ui/common/ExternalActivityLauncherTest.kt
new file mode 100644
index 00000000..a228c272
--- /dev/null
+++ b/feature/main/src/test/java/com/example/slowclock/ui/common/ExternalActivityLauncherTest.kt
@@ -0,0 +1,30 @@
+package com.example.slowclock.ui.common
+
+import android.content.ActivityNotFoundException
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class ExternalActivityLauncherTest {
+    @Test
+    fun `기본 화면이 열리면 대체 화면은 열지 않는다`() {
+        var calls = 0
+        assertTrue(launchExternalActivity(open = { calls++ }, fallback = { error("unexpected fallback") }))
+        assertEquals(1, calls)
+    }
+
+    @Test
+    fun `화면이 없으면 대체 설정을 연다`() {
+        var calls = 0
+        assertTrue(launchExternalActivity(open = { throw ActivityNotFoundException() }, fallback = { calls++ }))
+        assertEquals(1, calls)
+    }
+
+    @Test
+    fun `모든 화면이 없거나 정책으로 막혀도 실패를 반환한다`() {
+        assertFalse(launchExternalActivity(open = { throw ActivityNotFoundException() }))
+        assertFalse(launchExternalActivity(open = { throw SecurityException() }))
+        assertFalse(launchExternalActivity(open = { throw ActivityNotFoundException() }, fallback = { throw SecurityException() }))
+    }
+}
diff --git a/feature/main/src/test/java/com/example/slowclock/ui/done/DoneViewModelTest.kt b/feature/main/src/test/java/com/example/slowclock/ui/done/DoneViewModelTest.kt
index fccb726a..04cb2a98 100644
--- a/feature/main/src/test/java/com/example/slowclock/ui/done/DoneViewModelTest.kt
+++ b/feature/main/src/test/java/com/example/slowclock/ui/done/DoneViewModelTest.kt
@@ -72,4 +72,17 @@ class DoneViewModelTest {
             viewModel.onIntent(DoneIntent.ConsumeError)
             assertNull(viewModel.uiState.value.error)
         }
+
+    @Test
+    fun `반복 일정 완료와 취소는 표시된 발생일을 전달한다`() =
+        runTest {
+            todaySchedules.value = listOf(Schedule(id = "a", title = "산책", occurrenceDate = "2026-09-06"))
+            coEvery { scheduleRepository.markScheduleAsCompleted("a", any(), "2026-09-06") } returns
+                ScheduleRepository.ScheduleResult.Success(Unit)
+            val viewModel = DoneViewModel(scheduleRepository)
+            viewModel.onIntent(DoneIntent.ToggleComplete("a"))
+            viewModel.onIntent(DoneIntent.ToggleComplete("a"))
+            coVerify(exactly = 1) { scheduleRepository.markScheduleAsCompleted("a", true, "2026-09-06") }
+            coVerify(exactly = 1) { scheduleRepository.markScheduleAsCompleted("a", false, "2026-09-06") }
+        }
 }
diff --git a/feature/main/src/test/java/com/example/slowclock/ui/main/MainViewModelTest.kt b/feature/main/src/test/java/com/example/slowclock/ui/main/MainViewModelTest.kt
index 427cf7ab..ae9b8084 100644
--- a/feature/main/src/test/java/com/example/slowclock/ui/main/MainViewModelTest.kt
+++ b/feature/main/src/test/java/com/example/slowclock/ui/main/MainViewModelTest.kt
@@ -432,4 +432,147 @@ class MainViewModelTest {
 
             verify(exactly = 0) { scheduleRepository.observeSchedulesForDate(any(), any()) }
         }
+
+    @Test
+    fun `삭제 실패는 목록 갱신 뒤에도 같은 삭제를 재시도한다`() =
+        runTest {
+            todaySchedules.value = listOf(soon)
+            coEvery { scheduleRepository.deleteSchedule("s1") } returnsMany
+                listOf(
+                    ScheduleRepository.ScheduleResult.Error(AppError.NetworkError),
+                    ScheduleRepository.ScheduleResult.Success(Unit),
+                )
+            val viewModel = createViewModel()
+            viewModel.onIntent(MainIntent.RequestDelete("s1"))
+            viewModel.onIntent(MainIntent.ConfirmDelete)
+            assertEquals(
+                "s1",
+                viewModel.uiState.value.failedDelete
+                    ?.schedule
+                    ?.id,
+            )
+            verify(exactly = 0) { alarmScheduler.cancel(any()) }
+
+            todaySchedules.value = listOf(soon, done)
+            assertEquals(AppError.NetworkError, viewModel.uiState.value.error)
+            assertTrue(viewModel.uiState.value.canRetry)
+            viewModel.onIntent(MainIntent.Retry)
+
+            coVerify(exactly = 2) { scheduleRepository.deleteSchedule("s1") }
+            verify(exactly = 1) { alarmScheduler.cancel(soon) }
+            assertNull(viewModel.uiState.value.failedDelete)
+            assertNull(viewModel.uiState.value.pendingDelete)
+            assertEquals(
+                listOf("s2"),
+                viewModel.uiState.value.todaySchedules
+                    .map { it.id },
+            )
+        }
+
+    @Test
+    fun `삭제 중 목록 응답과 중복 확인이 와도 요청은 한 번이다`() =
+        runTest {
+            todaySchedules.value = listOf(soon)
+            val result = CompletableDeferred<ScheduleRepository.ScheduleResult<Unit>>()
+            coEvery { scheduleRepository.deleteSchedule("s1") } coAnswers { result.await() }
+            val viewModel = createViewModel()
+            viewModel.onIntent(MainIntent.RequestDelete("s1"))
+            viewModel.onIntent(MainIntent.ConfirmDelete)
+            todaySchedules.value = listOf(soon, done)
+            viewModel.onIntent(MainIntent.RequestDelete("s1"))
+            viewModel.onIntent(MainIntent.RequestDelete("s2"))
+            viewModel.onIntent(MainIntent.ConfirmDelete)
+            assertNotNull(viewModel.uiState.value.pendingDelete)
+            assertNull(viewModel.uiState.value.scheduleToDelete)
+            coVerify(exactly = 1) { scheduleRepository.deleteSchedule("s1") }
+            coVerify(exactly = 0) { scheduleRepository.deleteSchedule("s2") }
+            result.complete(ScheduleRepository.ScheduleResult.Success(Unit))
+            assertNull(viewModel.uiState.value.pendingDelete)
+            assertNull(viewModel.uiState.value.scheduleToDelete)
+        }
+
+    @Test
+    fun `삭제 실패를 닫으면 늦은 Retry 가 삭제를 다시 하지 않는다`() =
+        runTest {
+            todaySchedules.value = listOf(soon)
+            coEvery { scheduleRepository.deleteSchedule("s1") } returns ScheduleRepository.ScheduleResult.Error(AppError.NetworkError)
+            val viewModel = createViewModel()
+            viewModel.onIntent(MainIntent.RequestDelete("s1"))
+            viewModel.onIntent(MainIntent.ConfirmDelete)
+            viewModel.onIntent(MainIntent.ConsumeError)
+            viewModel.onIntent(MainIntent.Retry)
+            assertNull(viewModel.uiState.value.failedDelete)
+            coVerify(exactly = 1) { scheduleRepository.deleteSchedule("s1") }
+        }
+
+    @Test
+    fun `계정이 바뀐 뒤 이전 삭제 응답은 새 목록과 알람을 건드리지 않는다`() =
+        runTest {
+            val uid = MutableStateFlow<String?>("uid-1")
+            every { authRepository.observeCurrentUid() } returns uid
+            every { authRepository.currentUid } answers { uid.value }
+            todaySchedules.value = listOf(soon)
+            val result = CompletableDeferred<ScheduleRepository.ScheduleResult<Unit>>()
+            coEvery { scheduleRepository.deleteSchedule("s1") } coAnswers { withContext(NonCancellable) { result.await() } }
+            val viewModel = createViewModel()
+            viewModel.onIntent(MainIntent.RequestDelete("s1"))
+            viewModel.onIntent(MainIntent.ConfirmDelete)
+
+            uid.value = "uid-2"
+            val other = soon.copy(title = "새 계정 일정", userId = "uid-2")
+            todaySchedules.value = listOf(other)
+            result.complete(ScheduleRepository.ScheduleResult.Success(Unit))
+
+            assertEquals(listOf(other), viewModel.uiState.value.todaySchedules)
+            assertNull(viewModel.uiState.value.pendingDelete)
+            assertNull(viewModel.uiState.value.failedDelete)
+            assertNull(viewModel.uiState.value.error)
+            verify(exactly = 0) { alarmScheduler.cancel(any()) }
+        }
+
+    @Test
+    fun `삭제 실패 뒤 계정 전환은 재시도 대상을 지운다`() =
+        runTest {
+            val uid = MutableStateFlow<String?>("uid-1")
+            every { authRepository.observeCurrentUid() } returns uid
+            every { authRepository.currentUid } answers { uid.value }
+            todaySchedules.value = listOf(soon)
+            coEvery { scheduleRepository.deleteSchedule("s1") } returns ScheduleRepository.ScheduleResult.Error(AppError.NetworkError)
+            val viewModel = createViewModel()
+            viewModel.onIntent(MainIntent.RequestDelete("s1"))
+            viewModel.onIntent(MainIntent.ConfirmDelete)
+            uid.value = "uid-2"
+            viewModel.onIntent(MainIntent.Retry)
+            assertNull(viewModel.uiState.value.failedDelete)
+            assertFalse(viewModel.uiState.value.canRetry)
+            coVerify(exactly = 1) { scheduleRepository.deleteSchedule("s1") }
+        }
+
+    @Test
+    fun `반복 일정 완료와 취소는 표시된 발생일을 전달한다`() =
+        runTest {
+            val occurrence = soon.copy(occurrenceDate = "2026-09-06")
+            todaySchedules.value = listOf(occurrence)
+            coEvery { scheduleRepository.markScheduleAsCompleted("s1", any(), "2026-09-06") } returns
+                ScheduleRepository.ScheduleResult.Success(Unit)
+            val viewModel = createViewModel()
+            viewModel.onIntent(MainIntent.ToggleComplete("s1"))
+            viewModel.onIntent(MainIntent.ToggleComplete("s1"))
+            coVerify(exactly = 1) { scheduleRepository.markScheduleAsCompleted("s1", true, "2026-09-06") }
+            coVerify(exactly = 1) { scheduleRepository.markScheduleAsCompleted("s1", false, "2026-09-06") }
+        }
+
+    @Test
+    fun `알람 설정을 열지 못하면 소비할 수 있는 안내를 낸다`() =
+        runTest {
+            val viewModel = createViewModel()
+            viewModel.onIntent(MainIntent.ExactAlarmSettingsUnavailable)
+            assertTrue(
+                viewModel.uiState.value.userMessage
+                    .orEmpty()
+                    .contains("설정 화면을 열 수 없습니다"),
+            )
+            viewModel.onIntent(MainIntent.ConsumeUserMessage)
+            assertNull(viewModel.uiState.value.userMessage)
+        }
 }
diff --git a/feature/main/src/test/java/com/example/slowclock/ui/settings/SettingsViewModelTest.kt b/feature/main/src/test/java/com/example/slowclock/ui/settings/SettingsViewModelTest.kt
index 43666a6d..d7828dde 100644
--- a/feature/main/src/test/java/com/example/slowclock/ui/settings/SettingsViewModelTest.kt
+++ b/feature/main/src/test/java/com/example/slowclock/ui/settings/SettingsViewModelTest.kt
@@ -125,4 +125,23 @@ class SettingsViewModelTest {
             viewModel.onIntent(SettingsIntent.ConsumeFullScreenAlarmSettingsRequest)
             assertNull(viewModel.uiState.value.openFullScreenAlarmSettings)
         }
+
+    @Test
+    fun `의료 링크 요청을 소비하고 열기 실패 안내를 닫는다`() =
+        runTest {
+            val viewModel = createViewModel()
+            viewModel.onIntent(SettingsIntent.OpenMedicalNews)
+            assertNotNull(viewModel.uiState.value.openMedicalNews)
+            viewModel.onIntent(SettingsIntent.ConsumeMedicalNewsRequest)
+            assertNull(viewModel.uiState.value.openMedicalNews)
+            viewModel.onIntent(SettingsIntent.MedicalNewsUnavailable)
+            assertTrue(
+                viewModel.uiState.value.error
+                    ?.message
+                    .orEmpty()
+                    .contains("브라우저를 열 수 없습니다"),
+            )
+            viewModel.onIntent(SettingsIntent.ConsumeError)
+            assertNull(viewModel.uiState.value.error)
+        }
 }
diff --git a/feature/main/src/test/java/com/example/slowclock/ui/timeline/DaySwipeGestureTest.kt b/feature/main/src/test/java/com/example/slowclock/ui/timeline/DaySwipeGestureTest.kt
new file mode 100644
index 00000000..b3b74f0e
--- /dev/null
+++ b/feature/main/src/test/java/com/example/slowclock/ui/timeline/DaySwipeGestureTest.kt
@@ -0,0 +1,31 @@
+package com.example.slowclock.ui.timeline
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNull
+import org.junit.Test
+
+class DaySwipeGestureTest {
+    @Test
+    fun `작은 이동을 누적해 양쪽 날짜로 한 번만 이동한다`() {
+        for ((delta, expected) in listOf(20f to TimelineIntent.PreviousDay, -20f to TimelineIntent.NextDay)) {
+            val gesture = DaySwipeGesture(100f)
+            repeat(5) { assertNull(gesture.dragBy(delta)) }
+            assertEquals(expected, gesture.dragBy(delta))
+            assertNull(gesture.dragBy(delta * 20))
+            assertNull(gesture.dragBy(-delta * 20))
+        }
+    }
+
+    @Test
+    fun `왕복 이동은 순이동으로 판단하고 새 제스처는 초기화한다`() {
+        val gesture = DaySwipeGesture(100f)
+        assertNull(gesture.dragBy(80f))
+        assertNull(gesture.dragBy(-80f))
+        assertNull(gesture.dragBy(50f))
+        gesture.reset()
+        assertNull(gesture.dragBy(60f))
+        assertEquals(TimelineIntent.PreviousDay, gesture.dragBy(60f))
+        gesture.reset()
+        assertEquals(TimelineIntent.NextDay, gesture.dragBy(-120f))
+    }
+}
diff --git a/feature/main/src/test/java/com/example/slowclock/ui/timeline/TimelineViewModelTest.kt b/feature/main/src/test/java/com/example/slowclock/ui/timeline/TimelineViewModelTest.kt
index a8dfbe63..685b37d1 100644
--- a/feature/main/src/test/java/com/example/slowclock/ui/timeline/TimelineViewModelTest.kt
+++ b/feature/main/src/test/java/com/example/slowclock/ui/timeline/TimelineViewModelTest.kt
@@ -53,12 +53,22 @@ class TimelineViewModelTest {
         runTest {
             val viewModel = TimelineViewModel(scheduleRepository)
 
+            val requested = mutableListOf<Calendar>()
+            every { scheduleRepository.observeSchedulesForDate(capture(requested), any()) } returns
+                flowOf(listOf(Schedule(id = "a", title = "a")))
             viewModel.onIntent(TimelineIntent.SelectDate(2026, Calendar.SEPTEMBER, 20))
 
             val selected = viewModel.uiState.value.selectedDate
             assertEquals(2026, selected.get(Calendar.YEAR))
             assertEquals(Calendar.SEPTEMBER, selected.get(Calendar.MONTH))
             assertEquals(20, selected.get(Calendar.DAY_OF_MONTH))
+            assertEquals(2026, requested.single().get(Calendar.YEAR))
+            assertEquals(Calendar.SEPTEMBER, requested.single().get(Calendar.MONTH))
+            assertEquals(20, requested.single().get(Calendar.DAY_OF_MONTH))
+            assertEquals(0, requested.single().get(Calendar.HOUR_OF_DAY))
+            assertEquals(0, requested.single().get(Calendar.MINUTE))
+            assertEquals(0, requested.single().get(Calendar.SECOND))
+            assertEquals(0, requested.single().get(Calendar.MILLISECOND))
             assertEquals(
                 listOf("a"),
                 viewModel.uiState.value.schedules
@@ -72,11 +82,16 @@ class TimelineViewModelTest {
         runTest {
             val viewModel = TimelineViewModel(scheduleRepository)
             val start = viewModel.uiState.value.selectedDate
+            val tomorrow = (start.clone() as Calendar).apply { add(Calendar.DAY_OF_MONTH, 1) }
+            val requested = mutableListOf<Calendar>()
+            every { scheduleRepository.observeSchedulesForDate(capture(requested), any()) } returns flowOf(emptyList())
 
             viewModel.onIntent(TimelineIntent.NextDay)
-            assertEquals(start.timeInMillis + 24 * 60 * 60 * 1000L, viewModel.uiState.value.selectedDate.timeInMillis)
+            assertEquals(tomorrow.timeInMillis, viewModel.uiState.value.selectedDate.timeInMillis)
+            assertEquals(tomorrow.timeInMillis, requested.last().timeInMillis)
 
             viewModel.onIntent(TimelineIntent.PreviousDay)
             assertEquals(start.timeInMillis, viewModel.uiState.value.selectedDate.timeInMillis)
+            assertEquals(start.timeInMillis, requested.last().timeInMillis)
         }
 }