test: cover sentry streams and mock data

[Faisat-Creator]

Summary

• Add unit tests for the Sentry error-reporting wrapper
• Add unit tests for archived stream loading, refetching, and error handling
• Add unit tests for hidden, blocked, and pinned stream hooks
• Add unit tests for mock-store CRUD operations, events, and archive filtering

Validation

• Focused Vitest suite: 4 test files passed
• Tests passed: 13
• Prettier formatting passed
• Git whitespace check passed

Note: The repository-wide TypeScript check remains blocked by a pre-existing syntax error in hooks/use-webhooks.ts:308.

Closes #734
Closes #736
Closes #737
Closes #738

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