test: add integration test for creator page error boundary

[Aycode01]

closes #457

Description

This PR introduces an integration test for the creator page error boundary. This ensures that runtime rendering crashes isolated to the creator profile workspace are handled cleanly by displaying a contextual fallback view instead of triggering a complete application crash.

Changes Implemented

• src/components/__tests__/CreatorErrorBoundary.integration.test.tsx: Engineered a deterministic integration test configuration that:
  1. Mounts a self-destructing layout node within the error boundary tracking logic.
  2. Asserts fallback structure visibility post-crash.
  3. Validates that adjacent DOM elements outside the boundary scope remain responsive and unaffected.
  4. Confirms that the contextual navigation recovery link correctly points users back to the primary creator index path.

Verification Checklist

• Error boundary intercepts component rendering exceptions successfully.
• Application shell layers outside the error bubble remain interactive.
• Fallback container renders accurate recovery paths back to the creator list route.

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