Update button style

@@ -1545,11 +1545,24 @@
             transition: background-color 0.2s ease, color 0.2s ease;
         }
 
+        .graph-panel-button:disabled {
+            opacity: 0.5;
+            cursor: not-allowed;
+        }
+
         .graph-panel-button:hover {
             background-color: #000000;
             color: #ffffff;
         }
 
+        #graphFullBtn {
+            min-width: 96px;
+            height: 32px;
+            display: inline-flex;
+            align-items: center;
+            justify-content: center;
+        }
+
         .graph-status-chip {
             display: inline-flex;
             align-items: center;
@@ -5289,6 +5302,12 @@ function getConsoleContainer() {
             } else {
                 chip.textContent = textMap[state] || state;
             }
+            const fullBtn = document.getElementById('graphFullBtn');
+            if (fullBtn) {
+                const ready = state === 'ready';
+                fullBtn.disabled = !ready;
+                fullBtn.title = ready ? '在新标签页查看' : '知识图谱生成后可查看';
+            }
             if (message) {
                 setGraphPanelPlaceholder(message, state === 'error' ? 'error' : '');
             }