feat(web): project favicon and workspace icons in command subtitles

[gsimone]

Adds project favicon and model icon to threads in the command palette

Summary

• Command palette thread rows no longer use plain project · #branch text for the subtitle
• Subtitles now show the real project favicon, local vs worktree icons (Folder / FolderGit2), branch label, and harness/provider icon
• Layout is flipable via THREAD_COMMAND_SUBTITLE_VARIANT while iterating (favicon-workspace-harness default)

Test plan

• Open command palette and confirm recent threads show project favicons
• Compare a local/main thread vs a worktree thread icon
• Confirm harness icon matches the thread provider
• Confirm “Current thread” still appears on the active thread
• Search threads and verify the same subtitle treatment in results

Made with Cursor

Note

Add project favicons and provider icons to command palette thread subtitles

• Introduces ThreadCommandSubtitle, a new component that renders thread items in the command palette with project favicon, workspace/branch icon, provider icon, and a 'Current thread' marker.
• Extends buildThreadActionItems in CommandPalette.logic.ts with an optional renderDescription callback so callers can supply rich React subtitles instead of plain text.
• Builds provider instance and favicon maps in CommandPalette.tsx and passes them to ThreadCommandSubtitle via the new callback.
• Changes the description container class in CommandPaletteResults.tsx from truncate to min-w-0 so nested rich content can manage its own truncation.

^{Macroscope summarized 0c9200d.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

1 blocking correctness issue found. This PR adds visual icons to command palette thread subtitles - a presentational feature. However, there is an unresolved Medium-severity finding about provider entries potentially resolving incorrectly for remote threads, showing wrong or missing provider icons.

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