feat(ui): update model update badge to icon-only design

- Change badge from text label to icon-only for cleaner UI
- Adjust CSS for smaller circular badge with centered icon
- Maintain tooltip functionality for accessibility
- Update badge styling to be more compact and visually consistent

static/css/components/card.css

@@ -596,18 +596,22 @@
 }
 
 .model-update-badge {
-    display: inline-flex;
+    width: 18px;
-    align-items: center;
+    height: 18px;
-    gap: 6px;
+    padding: 0;
-    padding: 2px 10px;
+    border-radius: 4px;
-    border-radius: var(--border-radius-xs);
     background: var(--badge-update-bg);
     color: var(--badge-update-text);
     font-size: 0.7rem;
-    font-weight: 600;
+    display: inline-flex;
-    letter-spacing: 0.04em;
+    align-items: center;
-    text-transform: uppercase;
+    justify-content: center;
-    box-shadow: 0 4px 12px var(--badge-update-glow);
+    flex-shrink: 0;
+    box-shadow: 0 2px 6px var(--badge-update-glow);
     border: 1px solid color-mix(in oklab, var(--badge-update-bg) 55%, transparent);
-    white-space: nowrap;
+}
+
+.model-update-badge i {
+    margin-left: 1px;
+    line-height: 1;
 }

static/js/components/shared/ModelCard.js

@@ -597,7 +597,7 @@ export function createModelCard(model, modelType) {
                     </span>
                     ${hasUpdateAvailable ? `
                         <span class="model-update-badge" title="${updateBadgeTooltip}">
-                            ${updateBadgeLabel}
+                            <i class="fas fa-arrow-up"></i>
                         </span>
                     ` : ''}
                 </div>