add reproducer for repost comment visibility bug

This commit adds a minimal reproducer script that demonstrates a bug where comments on an original video are hidden when viewing that video via a Repost (Kind 6).

The issue stems from `normalizeCommentTarget` using the Repost's metadata (Kind 6, Reposter Pubkey) instead of the Original Video's metadata to generate the comment filter descriptor. This causes valid comments (which tag the Original Video) to be filtered out by `isVideoCommentEvent`.

Added:
- `examples/reproducers/2-repost-comment-visibility-bug/reproduce_issue.js`
- `examples/reproducers/2-repost-comment-visibility-bug/README.md`

css/tailwind.source.css

@@ -5291,7 +5291,8 @@
     font-size: var(--font-size-2xs);
     font-weight: 600;
     color: var(--text-muted);
-    transition: color var(--motion-duration-fast) var(--motion-ease-out),
+    transition:
+      color var(--motion-duration-fast) var(--motion-ease-out),
       background var(--motion-duration-fast) var(--motion-ease-out),
       border-color var(--motion-duration-fast) var(--motion-ease-out);
   }
@@ -5352,7 +5353,8 @@
     background: var(--surface-sunken);
     font-size: var(--font-size-xs);
     text-align: left;
-    transition: border-color var(--motion-duration-fast) var(--motion-ease-out),
+    transition:
+      border-color var(--motion-duration-fast) var(--motion-ease-out),
       background var(--motion-duration-fast) var(--motion-ease-out);
   }