feat: add lazy loading, non-blocking bookmarks, and file search fix

- Add lazy loading for result lists (load more on scroll/selection)
- Add non-blocking bookmark loading with JSON cache
- Add Firefox favicon extraction and caching
- Fix dynamic provider filtering (files/calc/websearch in All mode)
- Fix clippy warnings across core and plugins
- Add apex-neon theme
- Add aur/ to gitignore

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -12,3 +12,4 @@ aur/*/*.tar.xz
 aur/*/*.pkg.tar.*
 # Keep PKGBUILD and .SRCINFO tracked
 .SRCINFO
+aur/