Tests: Playwright test timeouts (#7231)

## Summary

See where we can use proper DOM waiting instead of waitForTimeout.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7231-WIP-Playwright-test-timeouts-2c36d73d3650812b966ac3d9c338dfd4)
by [Unito](https://www.unito.io)

browser_tests/fixtures/ComfyPage.ts

@@ -1272,9 +1272,6 @@ export class ComfyPage {
         }, 'image/png')
       })
     }, filename)
-
-    // Wait a bit for the download to process
-    await this.page.waitForTimeout(500)
   }
 
   /**

browser_tests/fixtures/components/ComfyNodeSearchBox.ts

@@ -60,9 +60,6 @@ export class ComfyNodeSearchBox {
     await this.input.waitFor({ state: 'visible' })
     await this.input.fill(nodeName)
     await this.dropdown.waitFor({ state: 'visible' })
-    // Wait for some time for the auto complete list to update.
-    // The auto complete list is debounced and may take some time to update.
-    await this.page.waitForTimeout(500)
     await this.dropdown
       .locator('li')
       .nth(options?.suggestionIndex || 0)

browser_tests/fixtures/components/SidebarTab.ts

@@ -116,7 +116,6 @@ export class WorkflowsSidebarTab extends SidebarTab {
   async switchToWorkflow(workflowName: string) {
     const workflowLocator = this.getOpenedItem(workflowName)
     await workflowLocator.click()
-    await this.page.waitForTimeout(300)
   }
 
   getOpenedItem(name: string) {
@@ -138,7 +137,6 @@ export class WorkflowsSidebarTab extends SidebarTab {
       .click()
     await this.page.keyboard.type(newName)
     await this.page.keyboard.press('Enter')
-    await this.page.waitForTimeout(300)
   }
 
   async insertWorkflow(locator: Locator) {

browser_tests/fixtures/components/Topbar.ts

@@ -95,7 +95,6 @@ export class Topbar {
   }
 
   async openTopbarMenu() {
-    await this.page.waitForTimeout(1000)
     await this.menuTrigger.click()
     await this.menuLocator.waitFor({ state: 'visible' })
     return this.menuLocator

browser_tests/fixtures/utils/litegraphUtils.ts

@@ -462,7 +462,6 @@ export class NodeReference {
   async convertToSubgraph() {
     await this.clickContextMenuOption('Convert to Subgraph')
     await this.comfyPage.nextFrame()
-    await this.comfyPage.page.waitForTimeout(256)
     const nodes = await this.comfyPage.getNodeRefsByTitle('New Subgraph')
     if (nodes.length !== 1) {
       throw new Error(
@@ -511,7 +510,6 @@ export class NodeReference {
         // Double-click to enter subgraph
         await this.comfyPage.canvas.dblclick({ position, force: true })
         await this.comfyPage.nextFrame()
-        await this.comfyPage.page.waitForTimeout(500)
 
         // Check if we successfully entered the subgraph
         isInSubgraph = await this.comfyPage.page.evaluate(() => {