feat: PWA overhaul

- Remove debug artifact from login page ('Use Link component: HOME')
- Full icon set: 48/72/96/128/144/152/192/384/512 + maskable variants
- Proper manifest: display_override, shortcuts, categories, scope
- Better service worker: offline fallback page, pre-caching, stale-while-revalidate
- Custom install banner (Android beforeinstallprompt + iOS instructions)
- Connection status indicator (online/offline toast)
- Updated index.html with proper favicon sizes and meta tags

web/public/manifest.json

@@ -1,22 +1,89 @@
 {
-  "name": "Dumpster",
+  "name": "Dumpster Chat",
   "short_name": "Dumpster",
   "description": "A chaotic, self-hosted Discord-like platform",
   "start_url": "/",
+  "scope": "/",
   "display": "standalone",
+  "display_override": ["window-controls-overlay", "standalone"],
+  "orientation": "any",
   "background_color": "#282828",
   "theme_color": "#282828",
-  "orientation": "any",
+  "categories": ["social", "communication"],
+  "lang": "en",
+  "dir": "ltr",
   "icons": [
+    {
+      "src": "/icons/icon-48.png",
+      "sizes": "48x48",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/icon-72.png",
+      "sizes": "72x72",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/icon-96.png",
+      "sizes": "96x96",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/icon-128.png",
+      "sizes": "128x128",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/icon-144.png",
+      "sizes": "144x144",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/icon-152.png",
+      "sizes": "152x152",
+      "type": "image/png"
+    },
     {
       "src": "/icons/icon-192.png",
       "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/icons/icon-192-maskable.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "maskable"
+    },
+    {
+      "src": "/icons/icon-384.png",
+      "sizes": "384x384",
       "type": "image/png"
     },
     {
       "src": "/icons/icon-512.png",
       "sizes": "512x512",
-      "type": "image/png"
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/icons/icon-512-maskable.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ],
+  "shortcuts": [
+    {
+      "name": "Create Account",
+      "short_name": "Register",
+      "url": "/?register=true",
+      "icons": [
+        {
+          "src": "/icons/icon-96.png",
+          "sizes": "96x96"
+        }
+      ]
     }
   ]
 }