fix(VideoModal): ensure normalized tags retain hash prefix

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]>

js/ui/components/VideoModal.js

@@ -3244,7 +3244,7 @@ export class VideoModal {
 
       seen.add(key);
 
-      const display = trimmed.startsWith("#") ? trimmed.slice(1) : trimmed;
+      const display = trimmed.startsWith("#") ? trimmed : `#${trimmed}`;
       normalized.push(display);
     }