Add MSC4522 username colors, release notes dialog, and profile layout fixes.

Replace legacy profile style metadata with MSC4133 profile fields, add in-app update notes, tighten account profile name spacing, and wire desktop media save helpers through the client.

vite.config.js

@@ -53,6 +53,11 @@ const copyFiles = {
       src: 'public/font',
       dest: 'public/',
     },
+    {
+      src: 'public/update/**/*',
+      dest: 'update',
+      rename: (_name, _ext, fullPath) => fullPath.replace(/^public[/\\]update[/\\]/, ''),
+    },
   ],
 };
 
@@ -124,6 +129,37 @@ function servePublicAssets() {
             res.setHeader('Content-Type', contentType);
             res.setHeader('Cache-Control', 'no-cache');
 
+            const fileStream = fs.createReadStream(resolvedPath);
+            fileStream.pipe(res);
+          } else {
+            res.writeHead(404);
+            res.end('File not found');
+          }
+        } else if (req.url?.startsWith('/update/')) {
+          const fileName = req.url.replace('/update/', '');
+          const resolvedPath = path.join(path.resolve(), 'public', 'update', fileName);
+
+          if (fs.existsSync(resolvedPath) && !resolvedPath.includes('..')) {
+            const ext = path.extname(fileName).toLowerCase();
+            const contentType =
+              ext === '.md'
+                ? 'text/markdown; charset=utf-8'
+                : ext === '.json'
+                  ? 'application/json'
+                  : ext === '.svg'
+                    ? 'image/svg+xml'
+                    : ext === '.png'
+                      ? 'image/png'
+                      : ext === '.jpg' || ext === '.jpeg'
+                        ? 'image/jpeg'
+                        : ext === '.webp'
+                          ? 'image/webp'
+                          : ext === '.gif'
+                            ? 'image/gif'
+                            : 'application/octet-stream';
+            res.setHeader('Content-Type', contentType);
+            res.setHeader('Cache-Control', 'no-cache');
+
             const fileStream = fs.createReadStream(resolvedPath);
             fileStream.pipe(res);
           } else {