fix(nixos): deploy Pi extensions globally

configs/nixos/modules/shell/pi/default.nix

@@ -40,9 +40,17 @@ in
         };
       };
 
-      # The first declarative rollout replaces the interactive settings file.
-      # Login state stays in auth.json, which this module does not manage.
-      home.file."${piDir}/settings.json".force = true;
+      home.file = {
+        # The first declarative rollout replaces the interactive settings file.
+        # Login state stays in auth.json, which this module does not manage.
+        "${piDir}/settings.json".force = true;
+
+        "${piDir}/extensions" = {
+          source = ./extensions;
+          recursive = true;
+          force = true;
+        };
+      };
     };
   };
 }