UI: Plan answer tabs sometimes render corrupted (~30%)

Type: bug
Summary
The Plan view intermittently renders with broken/corrupted tabs (~30% of runs). Selecting one tab often corrupts the others.

Steps to Reproduce

1. Start a Plan.
2. Observe rendered answer tabs.
3. Switch between tabs.

Observed
Tabs are visually corrupted. On Chrome and Firefox, desktop and Android. Temporarily mitigated by opening DevTools and toggling mobile viewport; some tabs recover.

Expected
Tabs render reliably without corruption.

Notes
This appears purely UI/rendering. Affects multiple browsers and platforms.