🤖 fix: deflake Storybook ChatInput focus (#1138)

Deflakes Storybook App bash/chat/reviews stories by removing
timing-based focus sleeps.

- Refactors ChatInput workspace auto-focus from setTimeout(100) to
bounded requestAnimationFrame retries.
- Exposes `data-autofocus-state="pending|done"` on
`[data-component="ChatInputSection"]` so stories can wait
deterministically.
- Stops auto-focus attempts early if another element outside ChatInput
has focus (avoid fighting user/modals).
- Updates stories to `waitFor` auto-focus completion instead of
`setTimeout(150)`.

Validation:
- make static-check
- make storybook-build
- make storybook (background) + make test-storybook

---
_Generated with `mux` • Model: `unknown` • Thinking: `unknown`_

Author: ammar-agent

.storybook/main.ts

@@ -19,6 +19,11 @@ const config: StorybookConfig = {
           // src/version.ts in the Chromatic CI workflow, not via alias here
         },
       },
+      // Prevent Vite from discovering new deps mid-test and forcing a full reload (test-storybook
+      // interprets reloads as navigations and flakes). Keep this list minimal.
+      optimizeDeps: {
+        include: ["@radix-ui/react-checkbox"],
+      },
     });
   },
 };