Flaky tests and observable state (#1526)

* Fix missing await

* Fix flaky tests - keyboard combos

Old code is causing playwright &/ changeTracker to add an undo step.  Using combo mode resolves flakiness until that can be investigated thoroughly.

* Restore skipped tests

* Fix flaky tests

* Async clean up

* Fix test always fails on retry

* Add TS types (tests)

* Fix flaky test

* Add observable busy state to workflow store

* Add workflow store busy wait to tests

* Rename test for clarity

* Fix flaky tests - use press() from locator API

Ref: https://playwright.dev/docs/api/class-keyboard#keyboard-press

* Fix flaky test - wait next frame

* Add delay between mouse events

Litegraph pointer handling is all custom coded, so a adding a delay between events for a bit of reality is actually beneficial.

browser_tests/menu.spec.ts

@@ -504,6 +504,7 @@ test.describe('Menu', () => {
       await comfyPage.menu.topbar.saveWorkflow(workflowName)
       expect(await comfyPage.menu.topbar.getTabNames()).toEqual([workflowName])
       await comfyPage.menu.topbar.closeWorkflowTab(workflowName)
+      await comfyPage.nextFrame()
       expect(await comfyPage.menu.topbar.getTabNames()).toEqual([
         'Unsaved Workflow'
       ])
@@ -525,8 +526,7 @@ test.describe('Menu', () => {
     })
 
     test('Displays keybinding next to item', async ({ comfyPage }) => {
-      const workflowMenuItem =
-        await comfyPage.menu.topbar.getMenuItem('Workflow')
+      const workflowMenuItem = comfyPage.menu.topbar.getMenuItem('Workflow')
       await workflowMenuItem.click()
       const exportTag = comfyPage.page.locator('.keybinding-tag', {
         hasText: 'Ctrl + s'