Show clear daily study states for decks

[AldanaBRZ]

Today and the native deck list now distinguish cards ready to study, learning cards due later today, decks finished for the day, and decks with nothing scheduled. Ready decks keep a Study action and ready-card count; later decks show an amber clock and next review time; finished decks show a green check and quieter background. The Today view refreshes at the next learning step or Anki day rollover.

The status comes from the local Anki scheduler and completion snapshot, including child decks and filtered cards, so it remains useful offline. English and Spanish labels are included.

Validation: the empty-deck UI regression failed before the change and passed afterward; targeted scheduler/Home tests, Android lint, and a full debug APK build.

[github-actions]

Snapshot diff report vs ankiquest. Open screenshot-diff for diffs.

• AllActivitiesScreenshotTest: 2 changes
• AnkiquestHomeScreenshotTest: 2 changes
• DeckPickerScreenshotTest: 8 changes
• DeckPickerTabletScreenshotTest: 1 change
• NavigationDrawerScreenshotTest: 2 changes
• ReviewRemindersScreenshotTest: 5 changes

All 20 changed screenshots

AllActivitiesScreenshotTest

• AnkiquestHomeActivity_compare.png
• AnkiquestHomeActivity_edgeToEdge_compare.png

AnkiquestHomeScreenshotTest

• today_320dp_200percent_compare.png
• today_320dp_compare.png

DeckPickerScreenshotTest

• edgeToEdge_30_decks_compare.png
• hierarchy_lines_collapsed_compare.png
• hierarchy_lines_compare.png
• hierarchy_lines_deep_nesting_compare.png
• hierarchy_lines_many_siblings_compare.png
• keyboard_studied_line_overlaying_deck_name_compare.png
• snackbar_keyboard_closed_compare.png
• snackbar_keyboard_open_compare.png

DeckPickerTabletScreenshotTest

• 30_decks_tablet_compare.png

NavigationDrawerScreenshotTest

• navigationDrawer_compare.png
• sideNavigationBar_compare.png

ReviewRemindersScreenshotTest

• studyOptionsFragmentHost_scheduleReminders_compare.png
• studyOptionsFragmentHost_systemBars_compare.png
• studyOptionsFragmentHost_systemBars_scrolledToEnd_compare.png
• studyOptionsFragmentHost_troubleshooting_compare.png
• studyOptionsFragmentHost_troubleshooting_systemBars_compare.png