Clears the remaining no-unused-vars warnings across the dashboard app and
server, desktop main, and engine sources. Dead React state destructures are
collapsed to setter-only, unused props are underscore-prefixed to preserve
API shape, and unreferenced catch bindings are dropped. No behaviour change.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
- Add file search API wiring in dashboard client/server with route coverage for /api/files/search
- Introduce useFileMention hook and FileMentionPopup component, integrated into ChatView and QuickChatFAB
- Resolve @file references in chat messages so referenced file content is included in AI context
- Add styling, mobile responsiveness, and focused tests for popup UI, hook behavior, chat resolution, and file services
