test: add failing test for textarea label overlap on scroll

The label in WidgetTextarea lacks a background color, causing scrolled
text content to show through the label. This test verifies the label
has a solid background to prevent this overlap.

browser_tests/tests/vueNodes/widgets/text/textareaLabelOverlap.spec.ts

@@ -0,0 +1,53 @@
+import {
+  comfyExpect as expect,
+  comfyPageFixture as test
+} from '../../../../fixtures/ComfyPage'
+import type { ComfyPage } from '../../../../fixtures/ComfyPage'
+
+test.describe(
+  'Textarea label overlap',
+  { tag: ['@widget'] },
+  () => {
+    test.beforeEach(async ({ comfyPage }) => {
+      await comfyPage.settings.setSetting('Comfy.VueNodes.Enabled', true)
+      await comfyPage.vueNodes.waitForNodes()
+    })
+
+    const getFirstClipNode = (comfyPage: ComfyPage) =>
+      comfyPage.vueNodes.getNodeByTitle('CLIP Text Encode (Prompt)').first()
+
+    const getTextarea = (comfyPage: ComfyPage) =>
+      getFirstClipNode(comfyPage).getByRole('textbox', { name: 'text' })
+
+    const getLabel = (comfyPage: ComfyPage) =>
+      getFirstClipNode(comfyPage).locator('label')
+
+    test('label should have a background color to prevent text showing through when scrolled', async ({
+      comfyPage
+    }) => {
+      const textarea = getTextarea(comfyPage)
+
+      // Fill with enough lines to cause scrollable content
+      const manyLines = Array.from(
+        { length: 20 },
+        (_, i) => `Line ${i + 1}`
+      ).join('\n')
+      await textarea.fill(manyLines)
+
+      const label = getLabel(comfyPage)
+      await expect(label).toBeVisible()
+
+      // The label must have a non-transparent background so scrolled text
+      // does not show through it.
+      const bgColor = await label.evaluate(
+        (el) => getComputedStyle(el).backgroundColor
+      )
+
+      // 'transparent' or 'rgba(0, 0, 0, 0)' means no background — the bug.
+      expect(
+        bgColor !== 'transparent' && bgColor !== 'rgba(0, 0, 0, 0)',
+        `Expected label to have a solid background color, but got "${bgColor}"`
+      ).toBe(true)
+    })
+  }
+)