refactor(mobile): centralize platform header rendering

[juliusmarminge]

Screen headers mixed native iOS toolbar code with Android rendering, so common routes had to understand both implementations.

Add one ScreenHeader API for titles, navigation, actions, nested menus, selection, and search. Its base iOS renderer and .android.tsx override own the platform differences. This two-file pattern also covers the lower-level button, native serializer, and git builders without re-export shims. Settings screens and the QR connection screen use this API, while ScreenHeaderButton and the native toolbar remain available for custom layouts. Move the native serializer and git header builders behind platform files to keep them out of Android.

Menu conversion preserves stable IDs, nested actions, disabled items, and selection. Native menu builders return direct toolbar items because the serializer does not mount arbitrary child components. The fallback terminal and git menus have accessible names. Compact iOS search uses the patched native toolbar; noncompact search uses the standard search bar directly, without an empty toolbar placeholder.

Validation:

• Four focused menu conversion/lookup tests passed, with adaptive navigation coverage.
• Mobile workspace typecheck and unused-file/dependency checks passed on this layer. Targeted lint passed with existing warnings in moved git code.
• Production exports confirm only the matching core renderer is included on each platform.
• Integrated-stack simulator verification is recorded below.

Stacked on #12384.

Runtime verification on September 18, 2026: the integrated stack at 47a3dcb was tested on an iPhone 17 Pro simulator (iOS 27.0) and T3Code_API_36_1 emulator (Android 16.0), one at a time. Compatible development clients were built and installed from this checkout, then connected to a disposable environment with seeded Git projects. Coverage included Home/list rendering, thread navigation, file search and word wrap, terminal menus and session selection, review diff selection, archive menus, and Settings Add Environment / scanner open and close. Temporary connections were removed and the devices and test servers were stopped. Tablet layouts, QR decoding, and Live Activity start/update/stop were not exercised. Screenshots use seeded demo content; any test counts in demo messages or terminal output are fixture text, not validation results.

The shared Settings header Add Environment action opened the form on both platforms. Scan QR code opened the scanner header, and Close scanner returned to the form. File search autofocus and Android hardware Back were exercised through the same core API.

iOS scanner header	Android scanner header

The pre-existing iOS archive keyboard issue and stale-connection loading limitation are recorded with comparison evidence in #12399.

Shared search shows the keyboard-dismiss X while editing. Verified on iOS that tapping it dismisses the keyboard and preserves the query and filtered results. Mobile typecheck and targeted lint pass.

Before: missing dismiss button	After: shared header dismiss button

Shown on Choose project from the top of the stack, #12496.

Prepared with Codex.

Summary by CodeRabbit

• New Features
  • Added a unified screen header experience across iOS and Android.
  • Added support for inline and overlay search, refresh actions, workspace navigation, menus, accessibility states, and customizable header actions.
  • Added native iOS toolbar support for buttons, labels, menus, nested actions, and spacing.
  • Added Android menu handling with nested groups, selection states, disabled actions, and reliable action lookup.
  • Settings and connection screens now provide consistent header actions across platforms.
• Bug Fixes
  • Improved accessibility labels and search behavior, including clearing search and dismissing the keyboard.

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This PR replaces shared mobile header infrastructure and changes production header, search, menu, sidebar, and platform-resolution behavior across iOS and Android. The breadth of new rendering and serialization logic makes this unsuitable for automatic approval.

^{You can add or adjust custom eligibility rules. Learn more.}

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ No successful main baseline artifact is available yet. This run establishes the initial measurement.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	—	13.5 KiB	—	15.1 KiB	✅
Codex	Thread snapshot wire	—	7.1 KiB	—	7.3 KiB	✅
Codex	Live turn WebSocket wire	—	6.5 KiB	—	7.8 KiB	✅
Codex	Live turn WebSocket decoded	—	56.3 KiB	—	66.4 KiB	✅
Codex	Live turn messages	—	10	—	21	✅
Claude	Total thread wire	—	13.5 KiB	—	15.1 KiB	✅
Claude	Thread snapshot wire	—	7.1 KiB	—	7.3 KiB	✅
Claude	Live turn WebSocket wire	—	6.4 KiB	—	7.8 KiB	✅
Claude	Live turn WebSocket decoded	—	57.0 KiB	—	66.4 KiB	✅
Claude	Live turn messages	—	9	—	21	✅

Baseline: unavailable · PR result: 1378426 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 114.0 KiB
• Claude decoded thread snapshot: 114.7 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

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📝 Walkthrough

Walkthrough

The change adds shared iOS and Android screen headers, native toolbar components, recursive header-menu conversion, serialized thread Git menus, and shared header usage in settings and connection screens.

Changes

Native controls

Layer / File(s)	Summary
Shared screen header contracts apps/mobile/src/components/ScreenHeader*, apps/mobile/src/components/ScreenHeaderButton*	Adds shared header types, iOS and Android rendering, search behavior, navigation controls, menu support, and platform-specific button exports.
Native toolbar implementation apps/mobile/src/native/NativeHeaderToolbar*, apps/mobile/src/native/StackHeader.tsx	Adds iOS toolbar conversion and Android no-op components. Moves the shared toolbar export into NativeHeaderToolbar.
Header menus and settings integration apps/mobile/src/components/headerMenu*, apps/mobile/src/components/nativeHeaderMenu.ios.tsx, apps/mobile/src/features/settings/..., apps/mobile/src/features/connection/ConnectionsNewRouteScreen.tsx	Adds recursive menu conversion and tests. Settings and connection screens use shared screen actions instead of platform-specific toolbar controls.
Thread Git controls apps/mobile/src/features/threads/ThreadGitControls*	Serializes Git menu definitions for native rendering and adds Android no-op exports. The terminal menu receives an accessibility label.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Refactor

Sequence Diagram(s)

sequenceDiagram
  participant SettingsScreen
  participant ScreenHeader
  participant NativeHeaderToolbar
  participant NativeHeaderMenu
  SettingsScreen->>ScreenHeader: provide actions and header configuration
  ScreenHeader->>NativeHeaderToolbar: provide toolbar items
  ScreenHeader->>NativeHeaderMenu: provide serialized menu items
  NativeHeaderToolbar->>SettingsScreen: render native toolbar controls
  NativeHeaderMenu->>SettingsScreen: invoke selected menu actions

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Merge Risk: ⚪ Minimal · up to 6a1f6

No actionable risk introduced or materially worsened by this incremental change remains.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 6.94% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 72 functions across 20 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: centralizing platform-specific mobile header rendering.
Description check	✅ Passed	The description explains the shared ScreenHeader API, platform-specific implementation, affected screens, menu behavior, validation, runtime verification, and UI changes with before/after evidence. It…

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In `@apps/mobile/src/native/NativeHeaderToolbar.ios.tsx`:
- Around line 141-148: Add explicit accessibilityLabel values to the terminal
and Git menu consumers: use “Open terminal” for the terminal menu and “Git
actions” for the Git menu, ensuring the NativeHeaderToolbar menu conversion
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- Around line 161-186: Update convertToolbarChild to handle
NativeHeaderToolbarSearchBarSlot so non-compact iOS search is serialized through
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