feat(hyprland): add "game mode" toggle

This mode turns off most animations and hides the UI to save resources.

home-manager/wayland/hyprland.nix

@@ -138,6 +138,9 @@ in {
         # Workspace manipulation
         "$mod, N, global, ${shell}:newworkspace"
         "$mod Shift, N, global, ${shell}:movetonewworkspace"
+
+        # Game Mode
+        "$mod, F1, exec, ${scripts}/gamemode"
       ] ++
       builtins.concatMap (n:
         let

home-manager/wayland/scripts/gamemode

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+HYPRGAMEMODE=$(hyprctl getoption animations:enabled | awk 'NR==1{print $2}')
+if [ "$HYPRGAMEMODE" = 1 ] ; then
+    hyprctl --batch "\
+        keyword animations:enabled 0;\
+        keyword animation borderangle,0; \
+        keyword decoration:shadow:enabled 0;\
+        keyword decoration:blur:enabled 0;\
+	    keyword decoration:fullscreen_opacity 1;\
+        keyword general:gaps_in 0;\
+        keyword general:gaps_out 0;\
+        keyword general:border_size 0;\
+        keyword decoration:rounding 0"
+    hyprctl dispatch global "quickshell:hidden"
+    hyprctl notify 1 2000 "rgb(73daca)" "Gamemode [ON]"
+    exit
+else
+    hyprctl notify 1 2000 "rgb(f7768e)" "Gamemode [OFF]"
+    hyprctl dispatch global "quickshell:hiddenoff"
+    hyprctl reload
+    exit 0
+fi
+exit 1