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/helpers/SettingsHelper.ts

@@ -6,7 +6,7 @@ export class SettingsHelper {
   async setSetting(settingId: string, settingValue: unknown): Promise<void> {
     await this.page.evaluate(
       async ({ id, value }) => {
-        await window['app'].extensionManager.setting.set(id, value)
+        await window.app.extensionManager.setting.set(id, value)
       },
       { id: settingId, value: settingValue }
     )
@@ -14,7 +14,7 @@ export class SettingsHelper {
 
   async getSetting<T = unknown>(settingId: string): Promise<T> {
     return await this.page.evaluate(async (id) => {
-      return await window['app'].extensionManager.setting.get(id)
+      return await window.app.extensionManager.setting.get(id)
     }, settingId)
   }
 }