feat(sway): bind brightness and ThinkPad XF86 multimedia keys

Install brightnessctl and bind all seven ThinkPad multimedia keys:
  - XF86MonBrightnessUp/Down  → brightnessctl ±5%
  - XF86AudioMicMute          → pactl source mute
  - XF86Bluetooth             → bt-toggle.sh (bluetoothctl + notify-send)
  - XF86ScreenSaver (Fn+F2)   → same as $mod+Shift+s (pause + swaylock)
  - XF86Sleep                 → systemctl suspend
  - XF86WLAN / XF86RFKill     → rfkill toggle

Note: rfkill may need a passwordless doas rule
(permit nopass :wheel cmd rfkill) or group membership to write
/dev/rfkill without privileges; not wired speculatively.

4 files changed, 37 insertions, 0 deletions

diff --git a/KEYBINDS.md b/KEYBINDS.md
index 69ba8de..3970a49 100644
--- a/KEYBINDS.md
+++ b/KEYBINDS.md
@@ -312,6 +312,14 @@ Mod key: `Super` (Mod4). Only personal additions beyond sway defaults listed.
 | `XF86AudioPlay`        | Play/pause                                    |
 | `XF86AudioNext`        | Next track                                    |
 | `XF86AudioPrev`        | Previous track                                |
+| `XF86MonBrightnessUp`  | Brightness +5% (brightnessctl)                |
+| `XF86MonBrightnessDown`| Brightness -5% (brightnessctl)                |
+| `XF86AudioMicMute`     | Mic mute toggle                               |
+| `XF86Bluetooth`        | Bluetooth power toggle (bluetoothctl)         |
+| `XF86ScreenSaver`      | Lock screen + pause media (same as Super+Shift+s)|
+| `XF86Sleep`            | Suspend system (systemctl suspend)            |
+| `XF86WLAN`             | Toggle Wi-Fi (rfkill)                         |
+| `XF86RFKill`           | Toggle all radios (rfkill)                    |
 | `Print`                | Region screenshot (grim+slurp)                |
 | `Shift+Print`          | Full screenshot (grim)                        |
 | `Super+Shift+s`        | Lock screen + pause media                     |
diff --git a/dot_config/sway/config b/dot_config/sway/config
index f88875b..7f95a62 100644
--- a/dot_config/sway/config
+++ b/dot_config/sway/config
@@ -135,6 +135,18 @@ bindsym XF86AudioPlay exec playerctl play-pause
 bindsym XF86AudioNext exec playerctl next
 bindsym XF86AudioPrev exec playerctl previous
 
+# Brightness
+bindsym XF86MonBrightnessUp exec brightnessctl set +5%
+bindsym XF86MonBrightnessDown exec brightnessctl set 5%-
+
+# ThinkPad multimedia keys
+bindsym XF86AudioMicMute exec pactl set-source-mute @DEFAULT_SOURCE@ toggle
+bindsym XF86Bluetooth exec ~/.config/sway/bt-toggle.sh
+bindsym XF86ScreenSaver exec "playerctl -a pause; swaylock -f -e -c 282828"
+bindsym XF86Sleep exec systemctl suspend
+bindsym XF86WLAN exec rfkill toggle wifi
+bindsym XF86RFKill exec rfkill toggle all
+
 # Screenshots
 bindsym Print exec sh -c 'grim -g "$(slurp)" - | tee ~/pics/screenshots/$(date +%Y-%m-%d-%H-%M-%S).png | wl-copy'
 bindsym Shift+Print exec sh -c 'grim - | tee ~/pics/screenshots/$(date +%Y-%m-%d-%H-%M-%S).png | wl-copy'
diff --git a/dot_config/sway/executable_bt-toggle.sh b/dot_config/sway/executable_bt-toggle.sh
new file mode 100644
index 0000000..95958f9
--- /dev/null
+++ b/dot_config/sway/executable_bt-toggle.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+# Toggle Bluetooth power via bluetoothctl. Uses notify-send's synchronous
+# hint so repeated toggles replace the previous notification instead of
+# stacking.
+set -eu
+
+state=$(bluetoothctl show | awk '/Powered:/ {print $2}')
+if [ "$state" = "yes" ]; then
+	bluetoothctl power off >/dev/null
+	notify-send -t 1500 -h string:x-canonical-private-synchronous:bt \
+		'Bluetooth' 'off'
+else
+	bluetoothctl power on >/dev/null
+	notify-send -t 1500 -h string:x-canonical-private-synchronous:bt \
+		'Bluetooth' 'on'
+fi
diff --git a/meta/wayland.txt b/meta/wayland.txt
index e451cbb..fa0f26f 100644
--- a/meta/wayland.txt
+++ b/meta/wayland.txt
@@ -42,6 +42,7 @@ zathura
 zathura-pdf-mupdf
 
 # Misc
+brightnessctl
 libfido2
 perl-file-mimeinfo
 qt5ct