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/github.ts

@@ -72,7 +72,7 @@ export class GitHubModelsClient implements ModelClient {
    * callback is provided, invoke it to obtain a token (e.g. via OAuth device flow).
    */
   private async ensureToken(): Promise<void> {
-    if (this.tokenResolved) return;
+    if (this.tokenResolved) {return;}
 
     // Try resolving again (user might have logged in via /login since construction)
     const token = getGitHubToken();
@@ -85,7 +85,7 @@ export class GitHubModelsClient implements ModelClient {
     if (this.onLoginRequired) {
       const newToken = await this.onLoginRequired();
       this.rebuildClient(newToken);
-      return;
+
     }
 
     // No token and no callback — the API call will fail with an auth error