feat: highlight matching characters in fuzzy file search

[bolinfest]

Using the new file-search API introduced in #1419, matching characters are now shown in bold in the TUI:

incremental-file-search-in-codex.mov

Fixes #1261

[github-actions]

Summary

Replaces the plain Vec<String> file-search results with Vec<FileMatch> objects and uses the supplied indices to bold the matching characters in the File Search popup.

Notes

• Propagates the new type through AppEvent, ChatWidget, BottomPane, etc.
• Turns compute_indices on, removes path-only mapping.
• Renders each match as a Line of Spans, adding Modifier::BOLD at the provided indices; selected row still gets yellow FG.

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Review

Nice quality-of-life improvement—code is tidy and the highlighting works well.

• Consider guarding against indices == None instead of expect, so we never panic on unexpected data.
• If the search library ever returns byte offsets, iterating over chars() could de-sync highlighting; you may want to clarify/convert.
• Otherwise LGTM!

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