fix: filter out (none) tags from patchsets

- Modified cvs_client.py to skip tags with value '(none)' using case-insensitive comparison
- Updated ui.js to also check for '(none)' tags when displaying patchsets
- Patchsets without tags no longer show any tag badge in the UI

cvs_proxy/cvs_client.py

@@ -366,7 +366,10 @@ class CVSClient:
                     current_patchset['author'] = author_match.group(1)
                 
                 if tag_match:
-                    current_patchset['tag'] = tag_match.group(1)
+                    tag_value = tag_match.group(1)
+                    # Don't store tags that are "(none)" or "(None)" - treat them as no tag (case-insensitive)
+                    if tag_value.lower() != '(none)':
+                        current_patchset['tag'] = tag_value
                 
                 if log_match:
                     # Log section starts, capture until next PatchSet or end