feat: Add tag support to file history display

- Modified cvs_client.py get_file_history() to parse and extract tags from CVS log
- Updated ui.js displayHistory() to render tags for each revision
- Added CSS styling for history tags with proper theming support
- Tags are displayed inline with revision information in history view

ui/styles.css

@@ -407,6 +407,31 @@ main {
     color: rgba(255, 255, 255, 0.9);
 }
 
+.history-tags {
+    display: flex;
+    gap: 0.25rem;
+    flex-wrap: wrap;
+}
+
+.history-tag {
+    display: inline-block;
+    padding: 0.125rem 0.5rem;
+    border-radius: 0.25rem;
+    font-size: 0.65rem;
+    font-weight: 600;
+    background-color: var(--primary-color);
+    color: white;
+    text-align: center;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+}
+
+.history-item.active .history-tag {
+    background-color: rgba(255, 255, 255, 0.2);
+    color: white;
+}
+
 /* Patchset View */
 .patchset-content {
     flex: 1;

ui/ui.js

@@ -244,6 +244,7 @@ class UIManager {
                 <div class="history-log-section">
                     <div class="history-log">${revision.log ? this.escapeHtml(revision.log) : ''}</div>
                     ${revision.state && revision.state !== 'Exp' ? `<span class="history-state">${revision.state}</span>` : ''}
+                    ${revision.tags && revision.tags.length > 0 ? `<span class="history-tags">${revision.tags.map(tag => `<span class="history-tag">${this.escapeHtml(tag)}</span>`).join('')}</span>` : ''}
                 </div>
                 <div class="history-author">${revision.author || 'Unknown'}</div>
                 <div class="history-date" title="${revision.date || 'N/A'}">${this.getRelativeDate(revision.date) || 'N/A'}</div>