feat: add eslint-plugin-playwright via oxlint JS plugins (#11136)

## Summary

Add eslint-plugin-playwright as an oxlint JS plugin scoped to
browser_tests/, enforcing Playwright best practices at lint time.

## Changes

- **What**: Configure eslint-plugin-playwright@2.10.1 via oxlint's alpha
`jsPlugins` field (`.oxlintrc.json` override scoped to
`browser_tests/**/*.ts`). 18 recommended rules +
`prefer-native-locators` + `require-to-pass-timeout` at error severity.
All 173 initial violations resolved (config, auto-fix, manual fixes).
`no-force-option` set to off — 28 violations need triage (canvas overlay
workarounds vs unnecessary force) in a dedicated PR.
- **Dependencies**: `eslint-plugin-playwright@^2.10.1` (devDependency,
required by oxlint jsPlugins at runtime)

## Review Focus

- `.oxlintrc.json` override structure — this is the first use of
oxlint's JS plugins alpha feature in this repo
- Manual fixes in spec files: `waitForSelector` → `locator.waitFor`,
deprecated page methods → locator equivalents, `toPass()` timeout
additions
- Compound CSS selectors replaced with `.and()` (Playwright native
locator composition) to avoid `prefer-native-locators` suppressions
- Lint script changes in `package.json` to include `browser_tests/` in
oxlint targets

---------

Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: GitHub Action <action@github.com>

browser_tests/tests/errorOverlay.spec.ts

@@ -100,7 +100,7 @@ test.describe('Error overlay', { tag: '@ui' }, () => {
       await errorOverlay
         .getByTestId(TestIds.dialogs.errorOverlayDismiss)
         .click()
-      await expect(errorOverlay).not.toBeVisible()
+      await expect(errorOverlay).toBeHidden()
 
       await comfyPage.canvas.click()
       await comfyPage.nextFrame()
@@ -112,10 +112,10 @@ test.describe('Error overlay', { tag: '@ui' }, () => {
       await comfyPage.nextFrame()
 
       await comfyPage.keyboard.undo()
-      await expect(errorOverlay).not.toBeVisible()
+      await expect(errorOverlay).toBeHidden()
 
       await comfyPage.keyboard.redo()
-      await expect(errorOverlay).not.toBeVisible()
+      await expect(errorOverlay).toBeHidden()
     })
   })
 
@@ -156,7 +156,7 @@ test.describe('Error overlay', { tag: '@ui' }, () => {
 
       await overlay.getByTestId(TestIds.dialogs.errorOverlaySeeErrors).click()
 
-      await expect(overlay).not.toBeVisible()
+      await expect(overlay).toBeHidden()
       await expect(comfyPage.page.getByTestId('properties-panel')).toBeVisible()
     })
 
@@ -168,7 +168,7 @@ test.describe('Error overlay', { tag: '@ui' }, () => {
 
       await overlay.getByTestId(TestIds.dialogs.errorOverlaySeeErrors).click()
 
-      await expect(overlay).not.toBeVisible()
+      await expect(overlay).toBeHidden()
     })
 
     test('"Dismiss" closes overlay without opening panel', async ({
@@ -181,10 +181,8 @@ test.describe('Error overlay', { tag: '@ui' }, () => {
 
       await overlay.getByTestId(TestIds.dialogs.errorOverlayDismiss).click()
 
-      await expect(overlay).not.toBeVisible()
-      await expect(
-        comfyPage.page.getByTestId('properties-panel')
-      ).not.toBeVisible()
+      await expect(overlay).toBeHidden()
+      await expect(comfyPage.page.getByTestId('properties-panel')).toBeHidden()
     })
 
     test('Close button (X) dismisses overlay', async ({ comfyPage }) => {
@@ -195,7 +193,7 @@ test.describe('Error overlay', { tag: '@ui' }, () => {
 
       await overlay.getByRole('button', { name: /close/i }).click()
 
-      await expect(overlay).not.toBeVisible()
+      await expect(overlay).toBeHidden()
     })
   })
 })