Add fullscreen PWA support

web/public/manifest.webmanifest

@@ -1,9 +1,32 @@
 {
+  "id": "/",
   "name": "Sybil",
   "short_name": "Sybil",
+  "description": "Sybil chat and search workspace",
   "start_url": "/",
   "scope": "/",
-  "display": "standalone",
-  "background_color": "#ffffff",
-  "theme_color": "#0f172a"
+  "display": "fullscreen",
+  "display_override": ["fullscreen", "standalone"],
+  "background_color": "#0b0718",
+  "theme_color": "#0f172a",
+  "icons": [
+    {
+      "src": "/icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/icons/icon-maskable-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ]
 }

web/public/sw.js

@@ -0,0 +1,12 @@
+self.addEventListener("install", () => {
+  self.skipWaiting();
+});
+
+self.addEventListener("activate", (event) => {
+  event.waitUntil(self.clients.claim());
+});
+
+self.addEventListener("fetch", (event) => {
+  if (event.request.mode !== "navigate") return;
+  event.respondWith(fetch(event.request));
+});