Make pages load fast on mobile

- Compress responses: page scripts and styles once (brotli or gzip, in
  memory) and cached immutable; pages and API JSON gzipped as they stream
- Service worker serves content-named assets cache-first
- Load the models modal's data when it opens (cached in localStorage)
  instead of shipping the model catalog in every conversation page
- Lazy-load the Tiptap composer and memoize thread messages
- Import lucide icons directly; twui 0.1.4 drops by-name icons from Button
- bun run start builds the pages minified before serving

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/utils/is-compressible-type.ts

@@ -0,0 +1,18 @@
+type Params = {
+    content_type?: string | null;
+};
+
+/**
+ * Whether a response of this content type is text worth compressing:
+ * pages, scripts, styles, JSON, SVG and the like. Media, fonts and
+ * streams (`text/event-stream`) are left as they are.
+ */
+export default function isCompressibleType({ content_type }: Params): boolean {
+    const type = content_type?.split(";")[0]?.trim().toLowerCase();
+
+    if (!type || type == "text/event-stream") return false;
+    if (type.startsWith("text/")) return true;
+
+    return /^application\/(javascript|json|manifest\+json|xml|[\w.-]+\+json|[\w.-]+\+xml)$/.test(type) ||
+        type == "image/svg+xml";
+}