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/frontends/tui/fullscreen.ts

@@ -31,7 +31,7 @@ export async function startFullscreenTui(config: FullscreenTuiConfig): Promise<v
       model: config.model,
       agent: config.agent,
       onExit: config.onExit,
-    })
+    }),
   );
 
   await waitUntilExit();