Add script to ensure icons for steam apps are installed

home.nix

@@ -1,4 +1,4 @@
-{ pkgs, ... }:
+{ pkgs, lib, ... }:
 
 {
   imports = [
@@ -72,6 +72,16 @@
 		ignition
   ];
 
+  home.activation.fixSteamIcons = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
+    for f in ~/.local/share/applications/*.desktop; do
+      id=$(grep -Eo 'steam://rungameid/[0-9]+' "$f" | sed 's#.*/##') || true
+      [ -n "$id" ] || continue
+      last=$(tail -n1 "$f" || true)
+      want="StartupWMClass=steam_app_$id"
+      [ "$last" = "$want" ] || echo "$want" >> "$f"
+    done
+  '';
+
   # theming
   stylix = {
     enable = true;