Polish PWA assets, accessible tabs and bulk selection, harden bulk revoke tests

web/pwa/manifest.webmanifest

@@ -12,6 +12,18 @@
       "src": "/icons/icon.svg",
       "sizes": "any",
       "type": "image/svg+xml",
+      "purpose": "any"
+    },
+    {
+      "src": "/icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
       "purpose": "any maskable"
     }
   ]