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

ui/ui.js

@@ -509,7 +509,7 @@ class UIManager {
                 <div class="patchset-number">PatchSet #${ps.patchset}</div>
                 <div class="patchset-log-section">
                     <div class="patchset-log">${ps.log ? this.escapeHtml(ps.log) : ''}</div>
-                    ${ps.tag && ps.tag !== 'N/A' ? `<span class="patchset-tag">${ps.tag}</span>` : ''}
+                    ${ps.tag && ps.tag !== 'N/A' && ps.tag.toLowerCase() !== '(none)' ? `<span class="patchset-tag">${ps.tag}</span>` : ''}
                 </div>
                 <div class="patchset-author">${ps.author || 'Unknown'}</div>
                 <div class="patchset-date" title="${ps.date || 'N/A'}">${this.getRelativeDate(ps.date) || 'N/A'}</div>