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/tests/changeTracker.spec.ts

@@ -7,12 +7,12 @@ import { DefaultGraphPositions } from '../fixtures/constants/defaultGraphPositio
 
 async function beforeChange(comfyPage: ComfyPage) {
   await comfyPage.page.evaluate(() => {
-    window['app'].canvas.emitBeforeChange()
+    window.app.canvas.emitBeforeChange()
   })
 }
 async function afterChange(comfyPage: ComfyPage) {
   await comfyPage.page.evaluate(() => {
-    window['app'].canvas.emitAfterChange()
+    window.app.canvas.emitAfterChange()
   })
 }
 
@@ -159,7 +159,7 @@ test.describe('Change Tracker', { tag: '@workflow' }, () => {
   test('Can detect changes in workflow.extra', async ({ comfyPage }) => {
     expect(await comfyPage.workflow.getUndoQueueSize()).toBe(0)
     await comfyPage.page.evaluate(() => {
-      window['app'].graph.extra.foo = 'bar'
+      window.app.graph.extra.foo = 'bar'
     })
     // Click empty space to trigger a change detection.
     await comfyPage.canvasOps.clickEmptySpace(