refactor(mobile): use shared Menu for markdown long presses

[juliusmarminge]

Chat link long-presses should use menus, without introducing a new bottom-sheet interaction.

Route Android markdown link gestures through the shared Menu component while preserving the existing anchored menu and action handlers. Keep iOS’s existing native per-link context menus and remove the action-sheet fallback. The rich-text adapter forwards only link long-presses, leaving ordinary taps and text selection with the markdown renderer.

This replaces the earlier action-sheet implementation in this PR. There is no new Dialog.actions API or catalog example.

Validation

• Mobile typecheck and focused lint passed.
• React Doctor: 100/100 for the changed file.
• Device gestures have not been rerun for this revision; this PR remains a draft.

Design-system progress

API adoption and Pen rendering are tracked separately. This is cumulative through this PR, not a claim that all native renderers are finished.

Pen component	After this PR
Host / native theme	Colors only; native typography and shapes left
List / Section / Row	Shared RN rows; native Form / ListItems left
Toggle	Native switches; Android checkmark treatment left
Segmented	Native + themed; custom rendering deferred
Menu	Shared Menu used for Android markdown links; iOS native per-link menus retained
Sheet	Shared API; Compose renderer and detent API left
Dialog	Native alerts / confirm / prompt; Android actions styled; action sheets deferred
SearchField	Shared API; native Android search left
Button / IconButton	Android native; standalone iOS native rendering left
Chip	Shared RN chip; native Android variants left
Toast	Custom themed toast retained
FAB	Native Android FAB; menu left
Toolbar	Unified API and platform renderers
AppBar	Native Android adopted; large / collapsing variants left
Picker / Slider / Stepper	Native sliders on both; full Picker / Stepper family left
Progress / EmptyState	Native progress + loader adoption; native iOS empty state left
Typography / shapes / motion	Control tokens adopted; native Host injection left
Split / list-detail / rail	Deferred broader layout work

Custom Appearance cards stay. Segmented controls stay native. Composer, thread-row and task-tray redesigns remain deferred.

Model: GPT-6.1. Harness: Codex.

Toast decision: retain the custom themed Toast on both platforms for Git progress, success, and errors. The native Snackbar experiment in #20017 was dropped after visual review.

---

[github-actions]

🚀 Expo continuous deployment is ready!

• Project → t3-code
• Platforms → android, ios
• Scheme → t3code-preview

	🤖 Android	🍎 iOS
Fingerprint	035e46c0805270afe707381d97627b8ca606ecb4	e944a9ee6b12d9b4dedf94a3f538611c061be178
Build Details	Build Permalink Details Distribution: INTERNAL Build profile: preview:dev Runtime version: 035e46c0805270afe707381d97627b8ca606ecb4 App version: 2.0.0 Git commit: e0b943d071b01a3cbfe09538bfa2992a29d17739	Build Permalink Details Distribution: INTERNAL Build profile: preview:dev Runtime version: e944a9ee6b12d9b4dedf94a3f538611c061be178 App version: 2.0.0 Git commit: 66cbf3d37ab0f420220ae574dd185b81b3cc6188
Update Details	Update Permalink Details Branch: pr-20019 Runtime version: 035e46c0805270afe707381d97627b8ca606ecb4 Git commit: eda5377f21e25533a973d5dace464b249111a918	Update Permalink Details Branch: pr-20019 Runtime version: e944a9ee6b12d9b4dedf94a3f538611c061be178 Git commit: eda5377f21e25533a973d5dace464b249111a918
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[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	—	4.9 KiB	—	6.8 KiB	✅
Codex	Thread snapshot wire	—	3.8 KiB	—	4.9 KiB	✅
Codex	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Codex	Live turn WebSocket decoded	—	20.8 KiB	—	29.3 KiB	✅
Codex	Live turn messages	—	1	—	8	✅
Claude	Total thread wire	—	5.0 KiB	—	6.8 KiB	✅
Claude	Thread snapshot wire	—	3.8 KiB	—	4.9 KiB	✅
Claude	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Claude	Live turn WebSocket decoded	—	21.2 KiB	—	29.3 KiB	✅
Claude	Live turn messages	—	2	—	8	✅

Baseline: unavailable · PR result: 9083b00 · 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: 108.5 KiB
• Claude decoded thread snapshot: 108.8 KiB

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

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 8361c0f and 9083b00.

📒 Files selected for processing: 1

• apps/mobile/src/native/EnrichedMarkdownText.tsx

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📝 Walkthrough

Android file-context menus now use Menu and open on long press. iOS no longer uses the ActionSheetIOS fallback. The Markdown renderer receives the menu’s optional long-press callback through MarkdownMenuAnchor.

Changes: Markdown context menus

Layer / File(s)	Summary
Platform-specific link context menus apps/mobile/src/native/EnrichedMarkdownText.tsx	Android link long presses build and open the file-context menu through Menu. MarkdownMenuAnchor passes the optional long-press callback to the Markdown renderer. The iOS ActionSheetIOS fallback is removed.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Refactor

Merge Risk: ⚪ Minimal · up to 9083b

The changed link-menu path has no established merge-blocking issue. Device gesture validation remains a normal pre-merge check.

Pre-merge checks: 3 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Description check		The description explains the intended behavior and reports validation, but it does not use or provide the required Problem, Change, Scope and approval, and Verification sections. It also lacks require…	Rewrite the description using the required headings. Add the problem and expected behavior, explain the implementation, provide a triaged issue or maintainer approval with scope justification, and document focused verification with observed…

Passed checks: 3 passed

Check name	Status	Explanation
Title check		The title clearly and concisely identifies the main change: using the shared Menu for mobile markdown long presses.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description explains the intended behavior and reports validation, but it does not use or provide the required Problem, Change, Scope and approval, and Verification sections. It also lacks required UI screenshots or a clear explanation of why approval is not needed.

Resolution

Rewrite the description using the required headings. Add the problem and expected behavior, explain the implementation, provide a triaged issue or maintainer approval with scope justification, and document focused verification with observed results. Add before/after screenshots for the UI change, or explain why they cannot be provided.

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[macroscopeapp]

Approvability

Verdict: Approved at 9083b00

Macroscope's review found this PR approvable — This is a focused one-file mobile refactor that reuses the existing shared menu and preserves the existing Android anchoring and action flow. Its only observable impact is localized markdown link-menu presentation and gesture plumbing, with no schema, security, deployment, or product-default changes.

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