fix(mobile): prevent overlapping Android thread rows

[none23]

What Changed

Use LegendList's ordinary row positioning and sizing on Android. Work-detail expansion reflows immediately there; iOS keeps its existing disclosure transitions.

Why

Fixes #5340. Long Android conversations can retain overlapping rows after switching threads or returning from another app. Even the existing zero-duration layout transition selects animated list containers. Keeping itemLayoutAnimation undefined on Android avoids that path consistently, without remounting the feed on resume.

Reproduced on a physical Redmi Note 8 Pro (Android 11) with the current native build and three seeded long conversations. With the change installed, eight thread switches and five returns from Android Settings kept messages separated. Mobile typecheck and targeted formatting/lint passed (lint has existing warnings outside this diff).

This only changes the shared Android thread feed. It applies across providers and connection modes; no server or contract changes are needed. Web, desktop, and iOS behavior is unchanged.

UI Changes

Before	After

Video

Before

before-small.mp4

After

after-small.mp4

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Model: GPT-6. Harness: Codex.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 6c58362 and 66dc17e.

📒 Files selected for processing (1)

• apps/mobile/src/features/threads/ThreadFeed.tsx

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📝 Walkthrough

Walkthrough

The thread feed now disables itemLayoutAnimation on Android. iOS retains its existing disclosure-settling and immediate layout transitions.

Changes

Thread feed layout animation

Layer / File(s)	Summary
Platform-specific layout animation apps/mobile/src/features/threads/ThreadFeed.tsx	Android now uses undefined for itemLayoutAnimation. iOS retains the existing transitions.

Priority: ➖ Normal

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

Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 66dc1

Android thread rows now use standard layout positioning to prevent overlap after thread switches or app resumes, while iOS behavior remains unchanged. No merge-blocking risk is identified.

Suggested reviewers: juliusmarminge, sunkenintime, t3dotgg

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The change directly addresses issue #5340 by disabling Android item layout animation to prevent stale or overlapping thread row layouts after thread switches or app resumes. iOS behavior remains uncha…
Out of Scope Changes check	✅ Passed	The changes are limited to the shared mobile thread feed and directly support the linked Android rendering fix. No unrelated code, platform behavior, server changes, or contract changes are included.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Title check	✅ Passed	The title clearly identifies the main change: preventing overlapping Android thread rows. It is concise and specific.
Description check	✅ Passed	The description is complete and follows the repository template. It explains the change, reason, scope, validation, and UI impact, and includes the required screenshots, videos, and checked checklist …

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