style: auto-fix ESLint issues (curly braces and formatting)

- Add curly braces to all if/else/for/while statements
- Fix indentation and trailing spaces
- Auto-fixed 372 linting errors using eslint --fix
- Remaining issues are warnings only (non-null assertions, explicit any types)

src/models/media.ts

@@ -178,7 +178,7 @@ export function normalizeMessagesForLocal(
 
   for (const msg of messages) {
     const text = getMessageTextWithTools(msg);
-    if (!text) continue; // drop empty messages
+    if (!text) {continue;} // drop empty messages
 
     const last = result.length > 0 ? result[result.length - 1] : undefined;
     if (last && last.role === msg.role) {