Error Boundary Coverage for High-Risk Widgets

- Complexity: Hard (200)
- Problem: Isolated widget failures can crash large page sections.
- Scope: Add granular error boundaries around player, charts, and live widgets.
- Implementation guidance: Wrap components in route-level boundaries with fallback UI.
- Acceptance criteria: Widget crash does not break entire page.
- Validation: Forced error test confirms fallback rendering.


