fix(tests): resolve JSDOM errors and tag sorting failures

- Update `tests/video-modal-accessibility.test.mjs` to unconditionally stub `HTMLMediaElement` methods (`pause`, `load`), fixing "Not implemented" errors in JSDOM.
- Refactor `VideoModal.normalizeVideoTags` to preserve tag casing while normalizing for deduplication (lowercase + strip #) and ensuring correct display format.
- Update `js/ui/components/tagPillList.js` to conditionally prepend `#` only if missing, preventing double-hashing (e.g., `##tag`).
- Remove unused `normalizeHashtag` import in `VideoModal.js`.
- Verify fixes with `tests/video-modal-tags.test.mjs`.

Co-authored-by: PR0M3TH3AN <[email protected]>

js/ui/components/VideoModal.js

@@ -38,7 +38,6 @@ import {
   formatShortNpub as defaultFormatShortNpub,
 } from "../../utils/formatters.js";
 import { sanitizeProfileMediaUrl } from "../../utils/profileMedia.js";
-import { normalizeHashtag } from "../../utils/hashtagNormalization.js";
 import { getBreakpointLg } from "../../designSystem/metrics.js";
 import { LinkPreviewService } from "../../services/linkPreviewService.js";
 import {
@@ -3224,19 +3223,29 @@ export class VideoModal {
       }
 
       const raw = typeof entry === "string" ? entry : String(entry ?? "");
-      const trimmed = normalizeHashtag(raw);
+      const trimmed = raw.trim();
 
       if (!trimmed) {
         continue;
       }
 
-      const key = trimmed.toLocaleLowerCase();
+      let key = trimmed.toLowerCase();
+      if (key.startsWith("#")) {
+        key = key.slice(1);
+      }
+
+      if (!key) {
+        continue;
+      }
+
       if (seen.has(key)) {
         continue;
       }
 
       seen.add(key);
-      normalized.push(trimmed);
+
+      const display = trimmed.startsWith("#") ? trimmed : `#${trimmed}`;
+      normalized.push(display);
     }
 
     return normalized.sort((a, b) =>