more cleaning up

public/manifest.webmanifest

@@ -3,23 +3,14 @@
   "short_name": "Garden",
   "description": "A joyful WebGPU drawing garden where coloured paths grow into organic agent trails.",
   "start_url": "./",
-  "scope": "./",
   "display": "fullscreen",
-  "display_override": ["fullscreen", "standalone", "minimal-ui"],
-  "orientation": "any",
   "background_color": "#10151f",
   "theme_color": "#10151f",
   "icons": [
     {
       "src": "favicon.svg",
       "sizes": "any",
-      "type": "image/svg+xml",
-      "purpose": "any"
-    },
-    {
-      "src": "pwa-64x64.png",
-      "sizes": "64x64",
-      "type": "image/png"
+      "type": "image/svg+xml"
     },
     {
       "src": "pwa-192x192.png",