fix: restore ExtensionManager API contract

- Revert extensionManager type from WorkspaceStore to ExtensionManager

- Remove WorkspaceStore export from workspaceStore.ts

- Add WorkspaceStore type to browser_tests/types/globals.d.ts

- Update browser tests to use specific 'as WorkspaceStore' casts

- Consolidate Window augmentation into single globals.d.ts file

Amp-Thread-ID: https://ampcode.com/threads/T-019c1854-3c3c-723d-8ce6-183ce06fcf1b
Co-authored-by: Amp <amp@ampcode.com>

browser_tests/fixtures/helpers/WorkflowHelper.ts

@@ -1,10 +1,8 @@
 import { readFileSync } from 'fs'
 
-import type { useWorkspaceStore } from '../../../src/stores/workspaceStore'
+import type { WorkspaceStore } from '../../types/globals'
 import type { ComfyPage } from '../ComfyPage'
 
-type WorkspaceStore = ReturnType<typeof useWorkspaceStore>
-
 export type FolderStructure = {
   [key: string]: FolderStructure | string
 }
@@ -45,7 +43,9 @@ export class WorkflowHelper {
     }
 
     await this.comfyPage.page.evaluate(async () => {
-      await window.app!.extensionManager.workflow.syncWorkflows()
+      await (
+        window.app!.extensionManager as WorkspaceStore
+      ).workflow.syncWorkflows()
     })
 
     // Wait for Vue to re-render the workflow list