feat(hypr): implement display and keyboard backlight dimming

hypr/scripts/dim-display.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCREEN_DEVICE="amdgpu_bl1"
+
+STATE_DIR="${XDG_RUNTIME_DIR:-/tmp}/hypridle"
+SCREEN_STATE_FILE="$STATE_DIR/screen"
+
+mkdir -p "$STATE_DIR"
+
+save_current() {
+  brightnessctl -d "$SCREEN_DEVICE" g >"$SCREEN_STATE_FILE"
+}
+
+dim() {
+  save_current
+  brightnessctl -d "$SCREEN_DEVICE" set 10%
+}
+
+restore() {
+  [[ -f "$SCREEN_STATE_FILE" ]] && brightnessctl -d "$SCREEN_DEVICE" s "$(cat "$SCREEN_STATE_FILE")"
+}
+
+case "${1:-}" in
+dim)
+  dim
+  ;;
+restore)
+  restore
+  ;;
+*)
+  echo "Usage: $0 {dim|restore}"
+  exit 1
+  ;;
+esac