fix(agent): optimize file mention search

[ErlichLiu]

Summary

• Replace synchronous recursive file scans with an async, bounded, watcher-invalidated file index.
• Rank matches by filename and relative path while excluding absolute path prefixes from matching.
• Preserve matching ancestors for the @file tree, normalize Windows separators, and select the highest-ranked visible match by default.
• Avoid an initial full scan on empty @ input and cap result sets.

Validation

• bun test apps/electron/src/main/lib/workspace-file-search.test.ts apps/electron/src/renderer/components/file-browser/FileMentionList.test.ts
• bun run --filter='@proma/electron' typecheck
• bun run --filter='@proma/electron' build:main
• bun run --filter='@proma/electron' build:renderer

Notes

• Full bun test still has two pre-existing Electron runtime mock failures in agent-session-manager.test.ts and channel-runtime-api-key.test.ts; the focused tests pass.

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