fix(mobile): cherry-pick upstream work-log and outbox fixes

[ronak-guliani]

Summary

• Cherry-picks 6 conflict-free upstream mobile fixes (verified with git apply --check against this fork):
  • keep highlighting review diffs after a long line (fix(mobile): keep highlighting review diffs after a long line pingdotgg/t3code#9911)
  • restore live tool shimmer and add a Thinking row (fix(mobile): restore live tool shimmer and add a Thinking row pingdotgg/t3code#10173)
  • even out the working pill spacing (fix(mobile): even out the working pill's spacing pingdotgg/t3code#10209)
  • only make work rows expandable when the body adds something (fix(mobile): only make work rows expandable when the body adds something pingdotgg/t3code#10210)
  • stop clipping expanded tool groups (fix(mobile): stop clipping expanded tool groups pingdotgg/t3code#10212)
  • keep pending tasks queued when a send fails in flight (fix(mobile): keep pending tasks queued when a send fails in flight pingdotgg/t3code#10245)
• No fork-owned files touched (app.config.ts, eas.json, connection/tunnel code unchanged).

Testing

• pnpm --filter @t3tools/mobile typecheck clean
• pnpm --filter @t3tools/mobile test: 155 files, 1379 tests passed
• pnpm lint: warnings only, no errors
• APP_VARIANT=preview npx expo export --platform ios: bundles clean (18MB .hbc)
• Simulator: launched installed Preview build on iPhone 17 Pro sim, confirmed app runs (screenshot); fresh dev-client rebuild blocked locally — Xcode 26.0.1 cannot compile Expo SDK 57 Swift (needs 26.4+, preflight gate). Recommend EAS simulator build or Xcode upgrade for on-device confirmation of new JS.
• Pre-existing pnpm fmt:check failure in perf-improvements.html untouched by this branch.

[Copilot]

🟢 Approval recommended

The cherry-picked changes match their upstream fixes and include focused regression coverage.

Pull request overview

Cherry-picks six upstream mobile reliability and UI fixes.

Changes:

• Improves work-log expansion, shimmer, spacing, sizing, and edge fades.
• Resumes diff highlighting after oversized lines.
• Retains queued tasks after transient delivery failures.

File summaries

File	Description
apps/mobile/src/state/thread-outbox.test.ts	Tests retry classification.
apps/mobile/src/state/thread-outbox-model.ts	Classifies transient failures by tag.
apps/mobile/src/lib/threadActivity.ts	Adds Thinking rows and improved work-row presentation.
apps/mobile/src/lib/threadActivity.test.ts	Covers feed presentation behavior.
apps/mobile/src/features/threads/ThreadFeed.tsx	Renders Thinking rows and passes fade colors.
apps/mobile/src/features/threads/thread-work-log.tsx	Fixes expansion sizing and edge fades.
apps/mobile/src/features/threads/floating-working-control.tsx	Corrects working-pill spacing.
apps/mobile/src/features/diffs/nativeReviewDiffHighlighter.ts	Resumes highlighting after long lines.
apps/mobile/src/features/diffs/nativeReviewDiffHighlighter.test.ts	Tests long-line highlighting behavior.
apps/mobile/src/components/AppSymbol.tsx	Adds Android brain-icon fallback.

Review details

• Files reviewed: 10/10 changed files
• Comments generated: 0
• Review effort level: Balanced

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