feat: Add theming with color and font support (#6)

fix: restore error recovery and add monitor lifecycle management (#5)

Restore worker = None on snapshot failure to recover from broken D-Bus connections. Add oneshot-based cancellation to monitor threads so old monitors are stopped before re-initialization, preventing thread accumulation. Log monitor thread spawn failures instead of silently discarding them.

feat: Make app AUR-ready (#2)

feat: Add scanning placeholder (#1)