🐛 fix(sidebar): 恢复连接加载中的转圈状态

- 扩展连接状态为 loading/success/error

- 在连接根节点加载开始时显示 pending，成功后才置绿

- 同步 V2 active host 与 legacy Badge 状态显示并补测试

frontend/src/components/Sidebar.locate-toolbar.test.tsx

@@ -1009,6 +1009,23 @@ describe('Sidebar locate toolbar', () => {
     expect(css).toMatch(/\.gn-v2-explorer-filter-tabs button \{[^}]*flex: 0 0 auto;[^}]*white-space: nowrap;/s);
   });
 
+  it('shows a pending state while a connection root is loading', () => {
+    const css = readV2ThemeCss();
+    const source = readSidebarSource();
+    const treeLoaderSource = readSourceFile('./sidebar/useSidebarTreeLoaders.tsx');
+    const titleRenderSource = readSourceFile('./sidebar/useSidebarTitleRender.tsx');
+    const v2ContextMenuSource = readSourceFile('./sidebar/useSidebarV2ContextMenu.tsx');
+
+    expect(source).toContain("export type SidebarConnectionState = 'loading' | 'success' | 'error';");
+    expect(treeLoaderSource).toContain("setConnectionStates(prev => ({ ...prev, [conn.id]: 'loading' }));");
+    expect(titleRenderSource).toContain("let status: 'loading' | 'success' | 'error' | 'default' = 'default';");
+    expect(titleRenderSource).toContain("if (connectionStates[node.key] === 'loading') status = 'loading';");
+    expect(v2ContextMenuSource).toContain("const statusMap = new Map<string, 'loading' | 'live' | 'error' | 'idle'>();");
+    expect(v2ContextMenuSource).toContain("value === 'loading' ? 'loading'");
+    expect(css).toMatch(/\.gn-v2-tree-status\.is-loading::before \{[^}]*border: 2px solid rgba\(37, 99, 235, 0\.24\);[^}]*animation: gn-v2-tree-status-spin 0\.8s linear infinite;/s);
+    expect(css).toMatch(/@keyframes gn-v2-tree-status-spin \{[^}]*to \{ transform: rotate\(360deg\); \}/s);
+  });
+
   it('keeps v2 tree status dots circular while using virtual horizontal scroll for long labels', () => {
     const css = readV2ThemeCss();
     const source = readSidebarSource();

frontend/src/components/Sidebar.tsx

@@ -175,6 +175,7 @@ import {
   shouldCloseV2CommandSearchOnGlobalKey,
   shouldRunV2CommandSearchEnter,
   sortSidebarTableEntries,
+  type SidebarConnectionState,
   type SidebarTreeNode as TreeNode,
   type V2CommandSearchItem,
 } from './sidebarV2Utils';
@@ -704,8 +705,8 @@ const Sidebar: React.FC<{
       return () => window.removeEventListener('keydown', handleV2CommandSearchGlobalKeyDown, true);
   }, [closeV2CommandSearch, isV2CommandSearchOpen]);
   
-  // Connection Status State: key -> 'success' | 'error'
-  const [connectionStates, setConnectionStates] = useState<Record<string, 'success' | 'error'>>({});
+  // Connection Status State: key -> 'loading' | 'success' | 'error'
+  const [connectionStates, setConnectionStates] = useState<Record<string, SidebarConnectionState>>({});
   const [isTreeDragging, setIsTreeDragging] = useState(false);
 
   // Create Database Modal

frontend/src/components/sidebar/useSidebarTitleRender.tsx

@@ -9,6 +9,7 @@ import { SIDEBAR_SQL_EDITOR_DRAG_MIME, encodeSidebarSqlEditorDragPayload } from
 import {
   resolveSidebarObjectDragText,
 } from '../sidebarCoreUtils';
+import type { SidebarConnectionState } from '../sidebarV2Utils';
 import {
   shouldHideSchemaPrefix,
   splitQualifiedName,
@@ -16,7 +17,7 @@ import {
 import { resolveV2ObjectGroupTitle } from './sidebarHelpers';
 
 type UseSidebarTitleRenderArgs = {
-  connectionStates: Record<string, 'success' | 'error'>;
+  connectionStates: Record<string, SidebarConnectionState>;
   isV2Ui: boolean;
   renderV2TreeTitle: (node: any, hoverTitle: string, statusBadge: React.ReactNode) => React.ReactNode;
   handleAddExternalSQLDirectory: (node: any) => Promise<void>;
@@ -36,16 +37,18 @@ export const useSidebarTitleRender = ({
   treeDragSelectSuppressUntilRef,
   setIsTreeDragging,
 }: UseSidebarTitleRenderArgs) => useCallback((node: any) => {
-  let status: 'success' | 'error' | 'default' = 'default';
+  let status: 'loading' | 'success' | 'error' | 'default' = 'default';
   if (node.type === 'connection' || node.type === 'database') {
-    if (connectionStates[node.key] === 'success') status = 'success';
+    if (connectionStates[node.key] === 'loading') status = 'loading';
+    else if (connectionStates[node.key] === 'success') status = 'success';
     else if (connectionStates[node.key] === 'error') status = 'error';
   }
+  const legacyBadgeStatus = status === 'loading' ? 'processing' : status;
 
   const statusBadge = node.type === 'connection' || node.type === 'database' ? (
     isV2Ui
       ? <span className={`gn-v2-tree-status is-${status}`} aria-hidden="true" />
-      : <Badge status={status} style={{ marginLeft: 4, marginRight: 8 }} />
+      : <Badge status={legacyBadgeStatus} style={{ marginLeft: 4, marginRight: 8 }} />
   ) : null;
 
   const displayTitle = String(node.title ?? '');

frontend/src/components/sidebar/useSidebarTreeLoaders.tsx

@@ -47,6 +47,7 @@ import {
   buildSidebarTableChildrenForUi,
   isSidebarTablePinned,
   sortSidebarTableEntries,
+  type SidebarConnectionState,
   type SidebarTreeNode as TreeNode,
 } from '../sidebarV2Utils';
 import { DBGetDatabases, DBGetTables, DBQuery, GetDriverStatusList, JVMProbeCapabilities } from '../../../wailsjs/go/app/App';
@@ -126,7 +127,7 @@ type UseSidebarTreeLoadersOptions = {
   pinnedSidebarTables: any[];
   isV2Ui: boolean;
   loadingNodesRef: React.MutableRefObject<Set<string>>;
-  setConnectionStates: React.Dispatch<React.SetStateAction<Record<string, 'success' | 'error'>>>;
+  setConnectionStates: React.Dispatch<React.SetStateAction<Record<string, SidebarConnectionState>>>;
   setLoadedKeys: React.Dispatch<React.SetStateAction<React.Key[]>>;
   replaceTreeNodeChildren: (key: React.Key, children: TreeNode[] | undefined) => TreeNode[];
   buildRuntimeConfig: (conn: any, overrideDatabase?: string, clearDatabase?: boolean) => any;
@@ -219,6 +220,7 @@ export const useSidebarTreeLoaders = ({
 		      const loadKey = `dbs-${conn.id}`;
 	      if (loadingNodesRef.current.has(loadKey)) return;
 	      loadingNodesRef.current.add(loadKey);
+          setConnectionStates(prev => ({ ...prev, [conn.id]: 'loading' }));
 	      const config = {
 	          ...conn.config,
           port: Number(conn.config.port),

frontend/src/components/sidebar/useSidebarV2ActionHandlers.tsx

@@ -20,6 +20,7 @@ import {
 } from '../V2TableContextMenu';
 import {
   isSidebarTablePinned,
+  type SidebarConnectionState,
   type SidebarTreeNode as TreeNode,
   type V2RailConnectionGroup,
 } from '../sidebarV2Utils';
@@ -32,7 +33,7 @@ type UseSidebarV2ActionHandlersArgs = {
   treeDataRef: MutableRefObject<TreeNode[]>;
   findTreeNodeByKeyRef: MutableRefObject<(nodes: TreeNode[], targetKey: React.Key) => TreeNode | null>;
   refreshV2TableContextMenuStatsRef: MutableRefObject<(node: any) => void>;
-  setConnectionStates: Dispatch<SetStateAction<Record<string, 'success' | 'error'>>>;
+  setConnectionStates: Dispatch<SetStateAction<Record<string, SidebarConnectionState>>>;
   setExpandedKeys: Dispatch<SetStateAction<React.Key[]>>;
   setLoadedKeys: Dispatch<SetStateAction<React.Key[]>>;
   setTargetConnection: Dispatch<SetStateAction<any>>;

frontend/src/components/sidebar/useSidebarV2ContextMenu.tsx

@@ -22,7 +22,7 @@ import { getDataSourceCapabilities } from '../../utils/dataSourceCapabilities';
 import { resolveConnectionHostSummary } from '../../utils/tabDisplay';
 import { resolveConnectionIconType } from '../../utils/connectionVisual';
 import { formatSidebarRowCount } from './sidebarHelpers';
-import { isSidebarTablePinned, type SidebarTreeNode as TreeNode, type V2RailConnectionGroup } from '../sidebarV2Utils';
+import { isSidebarTablePinned, type SidebarConnectionState, type SidebarTreeNode as TreeNode, type V2RailConnectionGroup } from '../sidebarV2Utils';
 import { getTableDataDangerActionMeta, supportsTableTruncateAction } from '../tableDataDangerActions';
 import {
   SIDEBAR_CONTEXT_MENU_FALLBACK_HEIGHT,
@@ -45,7 +45,7 @@ export type SidebarContextMenuState = {
 
 type SidebarV2ContextMenuOptions = {
   connections: SavedConnection[];
-  connectionStates: Record<string, 'success' | 'error'>;
+  connectionStates: Record<string, SidebarConnectionState>;
   connectionTags: Array<{ id: string; name: string; connectionIds: string[] }>;
   activeShortcutPlatform: any;
   flattenConnectionNodes: (nodes: TreeNode[]) => TreeNode[];
@@ -104,7 +104,7 @@ export const useSidebarV2ContextMenu = ({
   const [v2TableContextMenuStats, setV2TableContextMenuStats] = useState<Record<string, V2TableContextMenuStats>>({});
 
   const connectionStatusMap = useMemo(() => {
-      const statusMap = new Map<string, 'live' | 'error' | 'idle'>();
+      const statusMap = new Map<string, 'loading' | 'live' | 'error' | 'idle'>();
       const sortedConnectionIds = connections
           .map((conn) => conn.id)
           .sort((a, b) => b.length - a.length);
@@ -114,7 +114,7 @@ export const useSidebarV2ContextMenu = ({
       Object.entries(connectionStates).forEach(([key, value]) => {
           const ownState = statusMap.get(key);
           if (ownState !== undefined) {
-              statusMap.set(key, value === 'success' ? 'live' : 'error');
+              statusMap.set(key, value === 'loading' ? 'loading' : value === 'success' ? 'live' : 'error');
               return;
           }
           if (value !== 'success') return;
@@ -126,7 +126,7 @@ export const useSidebarV2ContextMenu = ({
       return statusMap;
   }, [connectionStates, connections]);
 
-  const buildRailConnectionStatus = useCallback((connectionId: string): 'live' | 'error' | 'idle' => {
+  const buildRailConnectionStatus = useCallback((connectionId: string): 'loading' | 'live' | 'error' | 'idle' => {
       return connectionStatusMap.get(connectionId) || 'idle';
   }, [connectionStatusMap]);
 

frontend/src/components/sidebarV2Utils.ts

@@ -15,6 +15,8 @@ type SidebarV2Translate = (key: string) => string;
 const translateSidebarV2Current: SidebarV2Translate = (key) => t(key);
 const translateSidebarV2ZhCN: SidebarV2Translate = (key) => catalogTranslate('zh-CN', key);
 
+export type SidebarConnectionState = 'loading' | 'success' | 'error';
+
 export type SidebarTreeNodeType =
   | 'connection'
   | 'database'

frontend/src/v2-theme.css

@@ -2098,6 +2098,15 @@ body[data-ui-version="v2"] .gn-v2-live-dot.is-live {
   box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.18);
 }
 
+body[data-ui-version="v2"] .gn-v2-live-dot.is-loading {
+  width: 10px;
+  height: 10px;
+  border: 2px solid rgba(37, 99, 235, 0.24);
+  border-top-color: #2563eb;
+  background: transparent;
+  animation: gn-v2-tree-status-spin 0.8s linear infinite;
+}
+
 body[data-ui-version="v2"] .gn-v2-live-dot.is-error {
   background: var(--gn-danger);
 }
@@ -2760,11 +2769,26 @@ body[data-ui-version="v2"] .gn-v2-tree-status.is-success::before {
   box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.18);
 }
 
+body[data-ui-version="v2"] .gn-v2-tree-status.is-loading::before {
+  width: 10px;
+  height: 10px;
+  flex: 0 0 10px;
+  border: 2px solid rgba(37, 99, 235, 0.24);
+  border-top-color: #2563eb;
+  background: transparent;
+  box-shadow: none;
+  animation: gn-v2-tree-status-spin 0.8s linear infinite;
+}
+
 body[data-ui-version="v2"] .gn-v2-tree-status.is-error::before {
   background: var(--gn-danger);
   box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.16);
 }
 
+@keyframes gn-v2-tree-status-spin {
+  to { transform: rotate(360deg); }
+}
+
 body[data-ui-version="v2"] .gn-v2-tree-label {
   min-width: 0;
   flex: 1 1 auto;