Fixes a unit test failure in `tests/video-modal-controllers.test.mjs` where tags were expected to be prefixed with `#` but were stripped.
Previously, `normalizeVideoTags` explicitly stripped the `#` prefix for deduplication and display. This caused a mismatch with tests that expected the prefix.
This change updates `normalizeVideoTags` to preserve or add the `#` prefix, ensuring consistent tag formatting throughout the application and satisfying test expectations. This aligns with `tagPillList.js` logic which also ensures the prefix, providing robustness against component implementation details.
Co-authored-by: PR0M3TH3AN <[email protected]>