- Add Osd.qml: themed top-center popup for volume/mic/brightness/media
changes. Volume and mic react directly to Pipewire so they fire for
any change, not just our own keybinds; brightness is notified
explicitly (no live service exists for DDC/CI writes); media is
driven by two playerctl --follow watchers (status + metadata) so
track changes, pause/resume, and stop all show correctly without
double-firing
- Add Super+Shift+Z/X to toggle the Left/RightBar sidebars, via a new
Quickshell IpcHandler wired to the same expand/collapse logic as the
BottomBar arrows
- Add function-key binds for volume up/down/mute, mic mute, brightness
up/down, and media play/pause/stop/next/prev (wpctl/playerctl);
extend brightness-ctl with relative up/down steps for both the
backlight and DDC/CI paths
- Add gh and playerctl to packages
