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/NodeOperationsHelper.ts

@@ -19,14 +19,14 @@ export class NodeOperationsHelper {
 
   async getGraphNodesCount(): Promise<number> {
     return await this.page.evaluate(() => {
-      return window['app']?.graph?.nodes?.length || 0
+      return window.app?.graph?.nodes?.length || 0
     })
   }
 
   async getSelectedGraphNodesCount(): Promise<number> {
     return await this.page.evaluate(() => {
       return (
-        window['app']?.graph?.nodes?.filter(
+        window.app?.graph?.nodes?.filter(
           (node: LGraphNode) => node.is_selected === true
         ).length || 0
       )
@@ -35,19 +35,19 @@ export class NodeOperationsHelper {
 
   async getNodes(): Promise<LGraphNode[]> {
     return await this.page.evaluate(() => {
-      return window['app'].graph.nodes
+      return window.app.graph.nodes
     })
   }
 
   async waitForGraphNodes(count: number): Promise<void> {
     await this.page.waitForFunction((count) => {
-      return window['app']?.canvas.graph?.nodes?.length === count
+      return window.app?.canvas.graph?.nodes?.length === count
     }, count)
   }
 
   async getFirstNodeRef(): Promise<NodeReference | null> {
     const id = await this.page.evaluate(() => {
-      return window['app'].graph.nodes[0]?.id
+      return window.app.graph.nodes[0]?.id
     })
     if (!id) return null
     return this.getNodeRefById(id)
@@ -66,7 +66,7 @@ export class NodeOperationsHelper {
         await this.page.evaluate(
           ({ type, includeSubgraph }) => {
             const graph = (
-              includeSubgraph ? window['app'].canvas.graph : window['app'].graph
+              includeSubgraph ? window.app.canvas.graph : window.app.graph
             ) as LGraph
             const nodes = graph.nodes
             return nodes
@@ -83,7 +83,7 @@ export class NodeOperationsHelper {
     return Promise.all(
       (
         await this.page.evaluate((title) => {
-          return window['app'].graph.nodes
+          return window.app.graph.nodes
             .filter((n: LGraphNode) => n.title === title)
             .map((n: LGraphNode) => n.id)
         }, title)