User Story:
As a user, I want to filter campaigns by category so that I can find causes relevant to my interests.
Acceptance Criteria:
- Category chips: Health, Education, Environment, Disaster Relief, Community, Other
- Multi-select filtering supported
- Active filters shown as removable tags
- Filter state reflected in URL query params
User Story:
As a user, I want to filter campaigns by category so that I can find causes relevant to my interests.
Acceptance Criteria: