v0.86.0 - Per-state Lucide icons on folder rows

What's changed\n\n- Per-state Lucide icons on folder rows (#94): each folder state now shows its own Lucide glyph at 16 px with stroke 2. Synchronized = green circle-check, syncing = spinning green circle-ellipsis, queued/paused = circle-pause, offline = globe-off, attention states (error, auth, keyring locked, deletion review) = red info glyph. The native GTK spinner is retired from the row.