feat(waybar+sway): bluetooth module + unify wifi/bt toggle paths

- systemd-units/system/bt.txt: new file pairing the meta/bt.txt group;
  enables bluetooth.service via 'just unit-apply'
- waybar: add the built-in bluetooth module; on-click runs the same
  bt-toggle.sh that XF86Bluetooth has always invoked. Status colors:
  blue when adapter is up, green when a device is connected, gray off
- sway: XF86WLAN now runs wifi-toggle.sh (iwd D-Bus) instead of
  'rfkill toggle wifi'. The latter required rfkill group membership
  (user is in wheel only), and aligning on the busctl path means the
  keybind and the waybar click drive the same code

XF86RFKill (panic-disable all radios) keeps using 'rfkill toggle all' —
that scope is genuinely rfkill-shaped.

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