serve static assets from local public/ instead of static.officer.dev, simplify gmail history 404/410 handling

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/apps/officer-web/index.html

@@ -11,7 +11,7 @@
     <meta property="og:title" content="Officer Dev (Alpha)" />
     <meta property="og:description" content="Your all-purpose AI operating system. Personal AI assistant, terminal, file browser, code editor, and customizable dashboards — all self-hosted." />
     <meta property="og:image" content="https://alpha.officer.dev/og-image-v3.jpg" />
-    <meta property="og:image:secure_url" content="https://static.officer.dev/og-image-v3.jpg" />
+    <meta property="og:image:secure_url" content="https://alpha.officer.dev/og-image-v3.jpg" />
     <meta property="og:image:width" content="1200" />
     <meta property="og:image:height" content="630" />
     <meta property="og:image:type" content="image/jpeg" />
@@ -25,10 +25,10 @@
     <meta name="twitter:image" content="https://alpha.officer.dev/og-image-v3.jpg" />
 
     <!-- Favicons & App Icons -->
-    <link rel="icon" type="image/x-icon" href="https://static.officer.dev/favicon.ico" />
-    <link rel="icon" type="image/png" sizes="96x96" href="https://static.officer.dev/favicon-96x96.png" />
-    <link rel="apple-touch-icon" sizes="180x180" href="https://static.officer.dev/apple-touch-icon.png" />
-    <link rel="manifest" href="https://static.officer.dev/site.webmanifest" />
+    <link rel="icon" type="image/x-icon" href="https://alpha.officer.dev/favicon.ico" />
+    <link rel="icon" type="image/png" sizes="96x96" href="https://alpha.officer.dev/favicon-96x96.png" />
+    <link rel="apple-touch-icon" sizes="180x180" href="https://alpha.officer.dev/apple-touch-icon.png" />
+    <link rel="manifest" href="https://alpha.officer.dev/site.webmanifest" />
     <meta name="theme-color" content="#1F2620" />
 
     <script src="https://cdn.jsdelivr.net/npm/eruda"></script>