refactor(mobile): share thread list section controls

[juliusmarminge]

Targets main independently. This PR has no dependency on V2 or another UI audit PR.

Home and thread navigation repeated V2 shelf headers and show-more rows. Shared section content now owns disclosure geometry, counts, rules, tones, and pane padding; ThreadListV2ShowMoreRow owns pagination presentation. Memoization, list virtualization, pagination state, and navigation remain unchanged.

Validation: threadListV2, home-list-options, and home-list-filter-menu tests, affected client typecheck, scoped lint, and React Doctor review. React Doctor’s existing consumer findings remain documented from the original audit; no new component findings were identified.

Code-only verification was requested; no browser/device pass or before/after screenshots are included. This remains a draft for visual review. No wire contracts, persisted data, or upgrade migrations change.

Model: GPT-6. Harness: Codex.

Summary by CodeRabbit

• UI Improvements
  • Standardized the “Show more” row for settled threads across the home screen and thread navigation.
  • Improved consistency for section dividers and snoozed or settled thread headers.
  • Updated accessibility announcements to report settled-thread counts more accurately.

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.5 KiB	13.5 KiB	−12 B (−0.1%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.1 KiB	7.0 KiB	−4 B (−0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.5 KiB	6.4 KiB	−8 B (−0.1%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	56.3 KiB	56.2 KiB	−44 B (−0.1%)	66.4 KiB	✅
Codex	Live turn messages	10	9	−1 (−10.0%)	21	✅
Claude	Total thread wire	13.5 KiB	13.5 KiB	+6 B (+0.0%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.1 KiB	7.1 KiB	+2 B (+0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.4 KiB	6.4 KiB	+4 B (+0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	57.0 KiB	57.0 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	9	9	0 (0.0%)	21	✅

Baseline: 53510d4 · PR result: 2dc943a · 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: 113.9 KiB
• Claude decoded thread snapshot: 114.6 KiB

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

[macroscopeapp]

Approvability

Verdict: Approved at 2dc943a

Macroscope's review found this PR approvable — This is a localized mobile UI refactor that replaces duplicated thread-list controls with shared components while preserving callbacks, accessibility behavior, pagination, and styling. It introduces no new capability, product-default change, schema change, or static-analysis override.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Team

Run ID: a714ad4b-19f2-4aff-bd0b-72fc79a07891

📥 Commits

Reviewing files that changed from the base of the PR and between 53510d4 and 2dc943a.

📒 Files selected for processing (3)

• apps/mobile/src/features/home/HomeScreen.tsx
• apps/mobile/src/features/threads/ThreadNavigationSidebar.tsx
• apps/mobile/src/features/threads/thread-list-v2-items.tsx

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📝 Walkthrough

Walkthrough

The PR centralizes thread-list section rendering and settled-thread expansion rows. The home screen and navigation sidebar now use the shared row. Accessibility messaging limits the announced settled-thread count to the settled page size.

Changes

Thread list presentation

Layer / File(s)	Summary
Shared section and expansion components apps/mobile/src/features/threads/thread-list-v2-items.tsx	Shared section rendering now supports tones, disclosure controls, accessibility state, and toggle callbacks. The show-more row caps its announced count at THREAD_LIST_V2_SETTLED_PAGE_COUNT.
Home screen integration apps/mobile/src/features/home/HomeScreen.tsx	The settled-thread footer now uses ThreadListV2ShowMoreRow with the hidden count and pagination callback. Unused inline-control imports were removed.
Sidebar integration apps/mobile/src/features/threads/ThreadNavigationSidebar.tsx	The settled-thread expansion control now uses ThreadListV2ShowMoreRow with the hidden count and expansion callback. The unused Pressable import was removed.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Refactor

Suggested reviewers: t3dotgg

Merge Risk: ⚪ Minimal · up to 2dc94

The shared presentation refactor has no identified merge-blocking risk.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: sharing thread list section controls across mobile views.
Description check	✅ Passed	The description explains what changed, why the refactor was made, validation performed, UI review status, and unchanged areas. It does not use the template headings or checklist format, and it states …
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.

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