fix(mobile): prevent overlapping text and UI on Android chat messages

[Exotic209093]

Assistant message containers had no width constraint, so Android Yoga unclamped-pass layout caused timestamps and copy buttons to overlap message text. List item content columns also lacked flexShrink, letting favicon icons bleed into text. Applied the same hasWideMarkdownBlock width-pinning already used for user bubbles, added flexShrink and overflow hidden to list content, and pinned favicon images to fixed size.

Fixes #11119

Summary by CodeRabbit

• Bug Fixes
  • Improved Markdown rendering in assistant messages to prevent wide content from breaking the message layout.
  • Preserved link icon sizing and contained oversized list content for more consistent display.
  • Improved assistant message width handling when Markdown includes wide blocks, helping maintain alignment and readability across different screen sizes.

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-13T18:20:12.239781Z	a38624b	PR opened

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[macroscopeapp]

Approvability

Verdict: Approved at a38624b

Macroscope's review found this PR approvable — This is a focused Android/mobile rendering fix that constrains markdown layout and preserves fixed-size icons to prevent chat text and controls from overlapping. It changes only localized presentation behavior and introduces no schema, security, billing, infrastructure, or product-default changes.

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Reviewed commit: a38624ba75

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[chatgpt-codex-connector]

Reuse the existing wide-block result

For every assistant-message render, this repeats the identical hasWideMarkdownBlock call already made in hasWideBlock above. On Android, ordinary long messages without an early match make the helper split and scan the entire message twice; while an assistant response is streaming, that redundant linear work and allocation recurs on every update in the performance-sensitive feed. Use the existing hasWideBlock value for the assistant width condition instead.

AGENTS.md reference: AGENTS.md:L15-L17

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[coderabbitai]

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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 da09034 and 66f3d90.

📒 Files selected for processing (1)

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

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📝 Walkthrough

Walkthrough

The mobile thread feed prevents inline link icons from shrinking, contains wide markdown list content, and applies full width to assistant rows with wide markdown blocks.

Changes

Android message layout

Layer / File(s)	Summary
Markdown and assistant layout containment apps/mobile/src/features/threads/ThreadFeed.tsx	Inline link icons no longer shrink. Markdown list content uses shrink and overflow utility classes. Assistant rows with wide markdown blocks use w-full.

Priority: ⬆️ High

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

Change: Bug fix · Severity of issue fixed: High

Suggested reviewers: juliusmarminge

Merge Risk: ⚪ Minimal · up to 66f3d

The Android layout containment changes have no identified correctness, availability, security, or data-integrity risk.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 1 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 primary change: preventing overlapping text and UI in Android chat messages.
Description check	✅ Passed	The description explains the layout problem, the implemented fix, and the linked issue. It does not use the template headings or include the required before-and-after screenshots for this UI change.
Linked Issues check	✅ Passed	The PR addresses the coding requirements in issue #11119. ThreadFeed.tsx applies w-full to assistant rows when wide Markdown blocks exist. List content uses shrink and overflow containment. Inline…
Out of Scope Changes check	✅ Passed	The PR changes only apps/mobile/src/features/threads/ThreadFeed.tsx. The width, shrink, overflow, and icon sizing changes directly support the Android chat overlap fixes in issue #11119. No unrelate…

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[Exotic209093]

Rebased onto latest main and resolved the conflict in ThreadFeed.tsx (kept main's mb-1 spacing together with the width-pinning style).