feat(bet-form): add error-boundary fallback UI with retry action (Closes #773)

[waterWang]

Description

Adds an attractive error-boundary fallback for BetForm with a retry action, as requested in issue #773.

Changes

• components/error-boundary.tsx: Updated fallback prop to support both ReactNode and render-function signatures. When passed a function, it receives { error, incidentId, resetErrorBoundary } for custom fallback rendering.
• src/components/BetFormErrorFallback.tsx: New BetForm-specific error fallback component with:
  • Alert icon and "couldn't load" message
  • Incident ID display for debugging
  • Retry button that resets the error boundary
  • Error message (visually hidden, available for testing)
  • Responsive layout with dark-mode support
• src/pages/BetForm.tsx: Wrapped the form content in ErrorBoundary with BetFormErrorFallback as the render-prop fallback
• src/pages/BetForm.error-boundary.test.tsx: 3 tests covering:
  • Fallback rendering with error details and incident ID
  • Retry button invocation
  • Rendering without incident ID

Testing

• ✅ npx jest src/pages/BetForm.error-boundary — 3/3 passing
• ✅ TypeScript compilation — no errors
• ✅ Existing BetForm tests unaffected (pre-existing failures unrelated to this change)

Closes #773

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