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/minimap.spec.ts

@@ -8,9 +8,7 @@ test.describe('Minimap', { tag: '@canvas' }, () => {
     await comfyPage.settings.setSetting('Comfy.Minimap.Visible', true)
     await comfyPage.settings.setSetting('Comfy.Graph.CanvasMenu', true)
     await comfyPage.workflow.loadWorkflow('default')
-    await comfyPage.page.waitForFunction(
-      () => window['app'] && window['app'].canvas
-    )
+    await comfyPage.page.waitForFunction(() => window.app && window.app.canvas)
   })
 
   test('Validate minimap is visible by default', async ({ comfyPage }) => {