test: add Window type augmentation and standardize window access

- Add browser_tests/types/globals.d.ts with Window interface augmentation

- Add types for app, graph, LiteGraph, LGraphBadge and test globals

- Standardize window['prop'] to window.prop across 37 test files

- Update browser_tests/tsconfig.json to include new type definitions

Amp-Thread-ID: https://ampcode.com/threads/T-019c16b3-cc31-70ea-9727-a933cb0ee942
Co-authored-by: Amp <amp@ampcode.com>

browser_tests/fixtures/components/SidebarTab.ts

@@ -154,7 +154,7 @@ export class WorkflowsSidebarTab extends SidebarTab {
 
     // Wait for workflow service to finish renaming
     await this.page.waitForFunction(
-      () => !window['app']?.extensionManager?.workflow?.isBusy,
+      () => !window.app?.extensionManager?.workflow?.isBusy,
       undefined,
       { timeout: 3000 }
     )

browser_tests/fixtures/components/Topbar.ts

@@ -85,7 +85,7 @@ export class Topbar {
 
     // Wait for workflow service to finish saving
     await this.page.waitForFunction(
-      () => !window['app'].extensionManager.workflow.isBusy,
+      () => !window.app.extensionManager.workflow.isBusy,
       undefined,
       { timeout: 3000 }
     )