FE-175 Add tests for the public events page search and filter functionality

[BigBen-7]

Track
Frontend

Difficulty
Medium

Description
The public events page search and category filter logic is tested at the integration level but filtering edge cases (no results, single category, combined search+filter) need explicit coverage.

Acceptance Criteria

• Test covers search returning no results (empty state shown).
• Test covers applying a category filter reducing the event list.
• Test covers combined search + category filter.
• All tests pass with npm test.

[Habibah371]

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This issue has been completed by @Habibah371 as part of the Stellar Wave Program's 5th Wave 🥳

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