fix(gaming): add Deadlock window classes and enable stayfocused

- Adds 'project8' and 'citadel' to the games list to correctly match Valve's Deadlock window class.
- Enables 'stayfocused' rule in mkGameRules to prevent focus loss.

modules/home/gaming.nix

@@ -6,6 +6,8 @@
 }: let
   games = [
     "Deadlock"
+    "project8"
+    "citadel"
   ];
 
   mkGameRules = selector: [
@@ -13,7 +15,7 @@
     "workspace name:gaming, ${selector}"
     "fullscreen, ${selector}"
     "immediate, ${selector}"
-    # "stayfocused, ${selector}"
+    "stayfocused, ${selector}"
   ];
 
   manualGameRules = lib.flatten (map (
@@ -75,4 +77,3 @@ in {
       ++ manualGameRules;
   };
 }
-