Improve web calendar layout and shared sync state

deploy/calendar-web/app/flutter_bootstrap.js

@@ -37,6 +37,6 @@ _flutter.buildConfig = {"engineRevision":"a10d8ac38de835021c8d2f920dbf50a920ccc0
 
 _flutter.loader.load({
   serviceWorkerSettings: {
-    serviceWorkerVersion: "2721834507" /* Flutter's service worker is deprecated and will be removed in a future Flutter release. */
+    serviceWorkerVersion: "1030817064" /* Flutter's service worker is deprecated and will be removed in a future Flutter release. */
   }
 });

deploy/calendar-web/nginx/default.conf

@@ -8,10 +8,19 @@ server {
         try_files $uri $uri/ /index.html;
     }
 
+    location = /favicon.png {
+        add_header Cache-Control "no-cache, no-store, must-revalidate";
+        try_files /favicon.png =404;
+    }
+
+    location = /manifest.json {
+        add_header Cache-Control "no-cache, no-store, must-revalidate";
+        try_files /manifest.json =404;
+    }
+
     location = /health {
         access_log off;
         add_header Content-Type text/plain;
         return 200 "ok\n";
     }
 }
-