Add tests for the public events page search

[Habibah371]

FE-175: Add Test Coverage for Public Events Page Search and Filter Functionality

Overview

This PR expands test coverage for the public events page by adding explicit integration tests for search and category filtering edge cases. While the existing test suite validates the general filtering flow, several important user scenarios were not directly covered.

Changes Implemented

Search Functionality Tests

• Added test to verify that searching with a term that matches no events displays the appropriate empty state.
• Validates that no event cards are rendered when no results are found.

Category Filter Tests

• Added test to verify that selecting a category filter correctly reduces the displayed event list.
• Confirms that only events belonging to the selected category remain visible.

Combined Search + Filter Tests

• Added test coverage for applying both a search query and category filter simultaneously.
• Verifies that results satisfy both filtering conditions.
• Ensures filtering logic remains consistent when multiple criteria are active.

Acceptance Criteria Coverage

• ✅ Search returning no results displays the empty state
• ✅ Category filter reduces the event list appropriately
• ✅ Combined search and category filter behavior is tested
• ✅ All tests pass with npm test

Testing

Added integration tests covering:

1. Empty search results scenario
2. Single category filtering
3. Combined search and category filtering
4. Result count and rendered event validation
5. Empty-state rendering validation

Impact

These tests improve confidence in the public events discovery experience by ensuring search and filtering logic behaves correctly across common edge cases and user interactions.
Closes #296

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