🐛 fix(store): 修复保存查询后再次打开产生重复Tab

- 新增语义去重：addTab对query类型按savedQueryId匹配已有Tab
- 匹配条件覆盖savedQueryId相同或Tab id等于savedQueryId两种场景
- 命中已有Tab时复用并激活，避免重复创建
- refs #280

frontend/src/store.ts

@@ -736,6 +736,18 @@ export const useStore = create<AppState>()(
                 return { tabs: newTabs, activeTabId: existingTab.id };
             }
         }
+        // 语义去重：对 query 类型按 savedQueryId 匹配已有 Tab（避免保存后重复打开）
+        if (tab.type === 'query' && tab.savedQueryId) {
+            const savedQueryIndex = state.tabs.findIndex(t =>
+                t.type === 'query' && (t.savedQueryId === tab.savedQueryId || t.id === tab.savedQueryId)
+            );
+            if (savedQueryIndex !== -1) {
+                const existingTab = state.tabs[savedQueryIndex];
+                const newTabs = [...state.tabs];
+                newTabs[savedQueryIndex] = { ...existingTab, ...tab, id: existingTab.id };
+                return { tabs: newTabs, activeTabId: existingTab.id };
+            }
+        }
         return { tabs: [...state.tabs, tab], activeTabId: tab.id };
       }),