fix(mobile): restore Android tablet thread controls, clean up header

[PixPMusic]

What Changed

• restore the compact T3 Code brand lockup in the Android split-view thread sidebar
• align the lockup with the primary thread-title column
• use the shared settings control instead of the divergent Android-native gear glyph
• expose the existing Android new-task FAB inside the persistent sidebar and keep list rows clear of it
• remove the empty Android detail pane's blank native-header wash
• keep the focused new-thread composer and toolbar attached to the Android keyboard, matching existing threads

Why

Android tablets and unfolded foldables use a separate split-view sidebar once the window reaches 720dp × 600dp. That sidebar had drifted from the phone surface: it showed a hardcoded “Threads” title, a different settings icon, and no persistent way to start a task.

The new-thread screen also used padding-based keyboard avoidance while existing threads used a frame-synced sticky composer. On a foldable, the IME could cover the new-thread toolbar even though the existing-thread toolbar remained visible.

The empty split-view detail route still mounted a blank Android native header, leaving a lighter strip and divider above the otherwise uniform detail background.

This addresses the header, settings, and new-task portions of #5338. Sidebar collapse is intentionally outside this focused PR.

UI Changes

Before	After

Both captures use the same deterministic dark-mode Threads fixture on an unfolded Pixel 9 Pro Fold AVD at its native 2076×2152 display size. Every “After” capture below was regenerated from the exact PR head (1a9de543f) using the production/Alpha variant in one emulator session.

Final baseline and empty-detail proof

New thread with keyboard open

Verification

• pnpm --filter @t3tools/mobile typecheck
• targeted formatting and lint for the changed mobile files
• git diff --check
• matched before/after pass on the real pixel_9_pro_fold Android hardware profile
• focused new-thread pass with the IME open; editor and toolbar accessibility bounds remain above the keyboard
• one fresh Codex review and one Claude Opus counter-review; the actionable animation and large-font clipping findings were addressed

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for the UI changes
• No new animation behavior was introduced

Model: GPT-5.6 Sol | Harness: Codex in T3 Code

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Note

Low Risk
Focused Android/iOS mobile UI and keyboard layout changes with no auth, data, or API impact; main risk is regressions on split-view navigation and IME overlap on new-thread compose.

Overview
Brings Android split-view (tablet/foldable) thread navigation in line with phone surfaces: the sidebar shows the T3 Code lockup instead of a hardcoded “Threads” title, uses the shared settings control (the Android-only header-actions file is removed), and gets the same bottom-right new task FAB via AndroidHomeFabLayout on the persistent sidebar—with extra list bottom inset so rows clear the FAB.

Split-view Home hides the empty detail pane’s native stack header on Android (headerShown: false); leaving split view explicitly restores headerShown: true when re-applying connection-aware brand options. CompactBrandTitle gains optional allowFontScaling (enabled for iOS nav bar rendering, disabled in the sidebar lockup).

On new thread (Android), the composer toolbar moves from padding-based KeyboardAvoidingView to KeyboardStickyView so it tracks the IME like existing thread composers. The sidebar sticky header drops scroll-driven gradient wash in favor of a solid drawer background.

^{Reviewed by Cursor Bugbot for commit 211d96b. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Restore Android tablet thread controls and clean up split-view header

• Adds a new-task FAB overlay to the thread navigation sidebar on Android tablets within split layouts by wrapping ThreadNavigationSidebar in AndroidHomeFabLayout inside AdaptiveWorkspaceLayout.tsx.
• Replaces the plain 'Threads' label in the sidebar header with CompactBrandTitle (font scaling disabled on Android) and removes the scroll-based header wash gradient from ThreadNavigationSidebar.tsx.
• Hides the navigation header in Android split-view and explicitly restores it with connection-aware brand options when leaving split view in HomeRouteScreen.tsx.
• Switches the Android composer in NewTaskDraftScreen from KeyboardAvoidingView to KeyboardStickyView, fixing control positioning during text input.
• Deletes the now-unused sidebar-header-actions.android.tsx.

^{Macroscope summarized 211d96b.}

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[macroscopeapp]

Approvability

Verdict: Approved 211d96b

Mobile UI fix restoring Android tablet FAB controls and simplifying header styling. Changes are self-contained platform-specific adjustments with no business logic impact, removing ~30 lines of gradient effects and consolidating header behavior.

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Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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Dismissing prior approval to re-evaluate 211d96b