This PR adds UI support for marking saved filters as favorites. The backend already supports the `is_favorite` field for saved filters, but the frontend didn't expose this functionality. Users can now favorite/unfavorite saved filters just like regular projects.
- Removes Cypress test framework entirely, using only Playwright for E2E tests
- All Cypress tests were already covered by Playwright; added 2 missing tests for URL filter/search parameters
- Removes ~2000 lines of Cypress code and configuration
- Updated ESLint and Stylelint configurations to reflect testing changes
🐰 Farewell to Cypress, dear and bright,
We hop to Playwright's testing light,
Factories cleared, the config gone,
Our tests now march in Playwright's song!
~✨ The Testing Rabbit
kolaente