feat: prevent duplicate cards, merge contexts, and display star badge when word is in library

app/static/css/style.css

@@ -3040,8 +3040,42 @@ body {
     text-align: center;
     font-size: 13px;
     font-weight: 600;
-    color: var(--success);
-    padding: 6px;
+    color: #f59e0b;
+    background: rgba(245, 158, 11, 0.12);
+    border: 1px solid rgba(245, 158, 11, 0.3);
+    border-radius: var(--radius-sm);
+    padding: 6px 10px;
+}
+
+.popup-in-library-badge {
+    display: inline-flex;
+    align-items: center;
+    gap: 3px;
+    font-size: 11px;
+    font-weight: 600;
+    color: #f59e0b;
+    background: rgba(245, 158, 11, 0.15);
+    border: 1px solid rgba(245, 158, 11, 0.4);
+    padding: 2px 7px;
+    border-radius: 9999px;
+    margin-left: 6px;
+    letter-spacing: 0.02em;
+    vertical-align: middle;
+}
+
+.badge-library-star {
+    display: inline-flex;
+    align-items: center;
+    gap: 4px;
+    font-size: 12px;
+    font-weight: 600;
+    color: #f59e0b;
+    background: rgba(245, 158, 11, 0.15);
+    border: 1px solid rgba(245, 158, 11, 0.4);
+    padding: 2px 8px;
+    border-radius: 9999px;
+    margin-left: 8px;
+    vertical-align: middle;
 }