refactor(mobile): organize design system and shared components

[juliusmarminge]

The mobile component folder mixed design-system controls with feature UI. Move the controls and their platform implementations into src/components/ui, keep cross-feature app components in src/components, and move seven feature-owned components into their owning features. Update imports and test mocks directly, without re-export shims or rendering changes.

Folder	Contents
components/ui	Text, symbols, buttons, rows, menus, dialogs, sheets, feedback, chrome, and their platform helpers
components	Shared composer pieces, file/media previews, branding, domain icons, loading and error-boundary UI
features/threads	Browser app icon, attachment button, copy button, clone banner
features/files	Audio preview
features/projects	Source-control icon
features/connection	Permission-update notice

Validation: mobile typecheck; 25 focused tests including platform dependency graphs, header menus, Git branches, questions, and project creation; native static checks; changed-file lint and formatting. React Doctor reported no change-specific findings. No visual behavior changes, so screenshots do not apply.

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
Component organization	Added here: components/ui, shared composites, feature-owned components
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.

---

[macroscopeapp]

Approvability

Verdict: Approved at 1c0da7b

Macroscope's review found this PR approvable — This PR reorganizes existing mobile UI and feature components without introducing new behavior; production changes are limited to equivalent import and relative-path updates. The large diff is primarily renames and caller/test updates, with no product-default or deployment changes.

No code changes detected at cdb3864. Prior analysis still applies.

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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	—	1	—	8	✅

Baseline: unavailable · PR result: cdb3864 · 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.

Dismissing prior approval to re-evaluate 1c0da7b

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