fix: S1 安全冲刺——切库清空标签页+冲刷(FR-V6)、重命名/移动同步标签页路径(FR-T7)、默认库路径设置页(FR-V5)；vaultBrowse IPC+pickDirectory；tab-store closeAll/renamePath；store resetEditor/syncCurrentPath；safety E2E 2 项

apps/desktop/src/main/ipc/handlers.ts

@@ -15,6 +15,7 @@ export function registerIpc(vault: VaultService) {
   ipcMain.handle(IPC.vaultSwitch, async (_e, p: { root: string }) => vault.switch(p.root));
   ipcMain.handle(IPC.vaultSetDefault, async (_e, p: { root: string }) => { await vault.setDefaultRoot(p.root); });
   ipcMain.handle(IPC.vaultPick, async () => vault.pickAndSwitch());
+  ipcMain.handle(IPC.vaultBrowse, async () => vault.pickDirectory());
 
   ipcMain.handle(IPC.treeList, async () => fs2().listTree());
   ipcMain.handle(IPC.treeRefresh, async () => fs2().listTree());

apps/desktop/src/main/services/vault-service.ts

@@ -39,6 +39,13 @@ export class VaultService {
     return this.switch(result.filePaths[0]);
   }
 
+  // 仅浏览选择目录路径，不切换（FR-V5 设置页浏览按钮）
+  async pickDirectory(): Promise<string | null> {
+    const result = await dialog.showOpenDialog({ properties: ['openDirectory'] });
+    if (result.canceled || result.filePaths.length === 0) return null;
+    return result.filePaths[0];
+  }
+
   async switch(root: string): Promise<VaultMeta> {
     // 校验是存在的目录
     const stat = await fs.stat(root).catch(() => null);