fix: 生成页面分支列表加载失败时显示错误提示

templates/pages/generate.html

@@ -28,6 +28,7 @@
             <button onclick="generate()" id="btn-generate" class="w-full bg-blue-600 text-white py-2 px-4 rounded-md hover:bg-blue-700">
                 生成 PR 描述
             </button>
+            <div id="load-error" class="hidden mt-3 p-3 bg-red-50 border border-red-200 rounded-md text-red-700 text-sm"></div>
         </div>
 
         <!-- Output -->
@@ -120,6 +121,11 @@
                 if (headBranch) headSelect.value = headBranch.name;
             } catch (err) {
                 console.error('Load refs error:', err);
+                const errDiv = document.getElementById('load-error');
+                errDiv.textContent = '加载分支列表失败: ' + err.message;
+                errDiv.classList.remove('hidden');
+                document.getElementById('base-ref').innerHTML = '<option value="">加载失败</option>';
+                document.getElementById('head-ref').innerHTML = '<option value="">加载失败</option>';
             }
         }