fix: improve log browsing and agent events

[Ziinc]

Motivation

• Improve log exploration UX: enable text selection, VSCode-like find, single-line truncated rows with inspect/send flows, and fix agent output being appended to a single row.
• Move checks/agent switcher into the nav and tidy filter/factory labels and layout.

Description

• New LogFeed: single-line truncated rows, drag/multi selection, inspect panel, and send-to-agent shown only when one row is selected.
• Added VSCode-style Cmd/Ctrl+F search overlay with highlighting, next/previous navigation, and auto-scrolling matches.
• Selection-based floating toolbar to send highlighted text to an agent; contextual send in the inspect panel.
• Replaced Checks/Agent buttons with a nav select, removed storage-path labels, and constrained search width.
• Backend change in agent_chat to persist incremental terminal updates as separate timestamped agent events instead of replacing the last event.
• Added LogFeed unit tests and updated integration tests to reflect the UI changes.

Testing

• npm run check succeeded and lint/format checks passed.
• Unit tests: src/components/LogFeed.test.tsx and src/lib/agentChatLogs.test.ts passed.
• Rust tests/integration requiring system libs or the NAPI addon failed to build in this environment due to missing glib-2.0 / src-tauri/target artifacts.
  [Codex Task](

[github-actions]

🚀 Web preview: https://preview-442.treq-9zy.pages.dev
📊 Lighthouse report: https://github.com/treq-dev/treq/actions/runs/34305409528/artifacts/10086621307

[Ziinc]

Merged latest origin/main into this branch (clean merge, one file — src-tauri/src/core/agent_chat.rs — auto-resolved by git, no manual conflict markers) and fixed the CI failure that was reported for de19620.

CI failure diagnosis (run 34305409625, 2 failed jobs):

1. verify / verify / ubuntu-22.04 (lint) — fixed, pushed in 92a63b8a:

   • src/components/LogFeed.tsx:115 — ESLint no-unexpected-multiline: a newline between .querySelectorAll(...) and [next] in moveMatch was being parsed as ambiguous property access. Split into an intermediate matchEls variable. This was introduced by this PR's own diff.
   • The other lint failure reported in that run (test/integration/workspace/create-pr.test.tsx exceeding the 500-line max-lines limit) is now moot — the merge with origin/main brought the file back down to 432 lines.

2. rust / test / windows-latest — not fixed here, pre-existing on main: 5 Windows-only test failures (jj::tests::reconcile_detached_external_checkout_reparents_home, reconcile_external_checkout_preserves_real_local_edit, reconcile_external_checkout_reparents_home_without_false_changes, reconcile_reparents_when_git_head_was_already_imported, commands::pty_commands::tests::resolves_workspace_id_to_absolute_working_directory). These come from main's home-repo reconcile logic (f41639b6) and are unrelated to this PR's log-viewer changes, so I left them alone rather than push an unrelated fix.

Also found (pre-existing on main, not touched):

• npm run lint: src/components/RemoteRepoScreen.tsx (unused exported function) and test/integration/sidebar-branch-switch-click-lock.test.tsx (userEvent.setup() placement) both already fail lint on main.
• npm run check:format: CommandPalette.tsx, WorkspaceDeletion.tsx, WorkspacePicker.tsx already fail biome format on main (a <p> wrapping difference) — LogFeed.tsx also needed a biome format pass after my fix, which is included in the pushed commit.

Branch is up to date with main and pushed to origin/ziinc/implement-log-viewer-updates-and-fixes.

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