feat(chat): add shared find menu

[waleedlatif1]

Summary

• Add Cmd/Ctrl-F to chat using the shared find bar and existing highlight colors.
• Navigate matching text across virtualized messages, restore composer focus, and keep streaming from pulling the selected match out of view.
• Reuse displayed mention text and exclude hidden metadata from search.

Type of Change

• New feature

Testing

• Cleanup review across React, state, styling, query, URL state, comments, and test-audit passes.
• 57 focused tests covering chat text parsing, message segmentation, copyable Markdown, and neighboring chat rendering logic.
• App type-check, repository lint, all 51 audits, block-registry check, and docs-manifest check.
• Browser verification with 120 virtualized messages: keyboard navigation and wrapping, Markdown and mention highlights, line breaks, code, no results, capped results, focus restoration, chat switches, and streaming.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing (new tests pass the test-audit authoring gate)
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Sep 27, 2026 2:15am UTC

[cubic-dev-ai]

All reported issues were addressed across 13 files

<sub>Reply with feedback, questions, or to request a fix.

Fix all with cubic | Re-trigger cubic</sub>

[greptile-apps]

Confidence Score: 5/5

[Medium risk] Adds find-in-chat search across message content.

The PR appears safe to merge; no new actionable issue was established.

Summary

The PR adds a shared find bar to chat, with search across virtualized messages, match highlighting and navigation, focus restoration, and scrolling coordination during streaming. The change since the previous review defers send scrolling while find is open so it can be retried when find closes.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[Open chat find] --> B[Search displayed message text]
  B --> C[Select and reveal match]
  C --> D[Pause automatic scrolling]
  D --> E[Close find]
  E --> F[Restore focus and retry pending send scroll]

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_{Reviews (3) · Last reviewed commit: "fix(chat): resume pending send scroll af..."}

[waleedlatif1]

@greptile

[waleedlatif1]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

@waleedlatif1 I have started the AI code review. It will take a few minutes to complete.

[cubic-dev-ai]

No issues found across 13 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}

[waleedlatif1]

@greptile

[waleedlatif1]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

@waleedlatif1 I have started the AI code review. It will take a few minutes to complete.

[cubic-dev-ai]

No issues found across 13 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}