fix: remove conditional guards from widget copy button tests

Assert element presence explicitly so regressions that remove the
copy affordance fail the test instead of silently passing.
Also scopes the group container selector to textarea widgets.

Addresses review feedback:
https://github.com/Comfy-Org/ComfyUI_frontend/pull/9554#discussion_r2924091297
https://github.com/Comfy-Org/ComfyUI_frontend/pull/9554#discussion_r2925889829

browser_tests/tests/widgetCopyButton.spec.ts

@@ -26,59 +26,43 @@ test.describe('Widget copy button', { tag: '@ui' }, () => {
   })
 
   test('Copy button has correct aria-label', async ({ comfyPage }) => {
-    const copyButtons = comfyPage.page.locator(
-      '[data-node-id] button[aria-label]'
-    )
-    const count = await copyButtons.count()
-
-    if (count > 0) {
-      const button = copyButtons.filter({
-        has: comfyPage.page.locator('.icon-\\[lucide--copy\\]')
-      })
-      if ((await button.count()) > 0) {
-        await expect(button.first()).toHaveAttribute('aria-label', /copy/i)
-      }
-    }
+    const copyButton = comfyPage.page
+      .locator('[data-node-id] button[aria-label]')
+      .filter({ has: comfyPage.page.locator('.icon-\\[lucide--copy\\]') })
+      .first()
+    await expect(copyButton).toBeAttached()
+    await expect(copyButton).toHaveAttribute('aria-label', /copy/i)
   })
 
   test('Copy icon uses lucide copy class', async ({ comfyPage }) => {
-    const copyIcons = comfyPage.page.locator(
-      '[data-node-id] .icon-\\[lucide--copy\\]'
-    )
-    const count = await copyIcons.count()
-
-    if (count > 0) {
-      await expect(copyIcons.first()).toBeVisible()
-    }
+    const copyIcon = comfyPage.page
+      .locator('[data-node-id] .icon-\\[lucide--copy\\]')
+      .first()
+    await expect(copyIcon).toBeAttached()
   })
 
   test('Widget container has group class for hover', async ({ comfyPage }) => {
-    const textareas = comfyPage.page.locator('[data-node-id] textarea')
-    const count = await textareas.count()
-
-    if (count > 0) {
-      const container = textareas.first().locator('..')
-      await expect(container).toHaveClass(/group/)
-    }
+    const textarea = comfyPage.page
+      .locator('[data-node-id] textarea')
+      .first()
+    await expect(textarea).toBeVisible()
+    const container = textarea.locator('..')
+    await expect(container).toHaveClass(/group/)
   })
 
   test('Copy button exists within textarea widget group container', async ({
     comfyPage
   }) => {
-    const groupContainers = comfyPage.page.locator('[data-node-id] div.group')
-    const count = await groupContainers.count()
+    const container = comfyPage.page
+      .locator('[data-node-id] div.group:has(textarea)')
+      .first()
+    await expect(container).toBeVisible()
+    await container.hover()
+    await comfyPage.nextFrame()
 
-    if (count > 0) {
-      const container = groupContainers.first()
-      await container.hover()
-      await comfyPage.nextFrame()
-
-      const copyButton = container.locator('button').filter({
-        has: comfyPage.page.locator('.icon-\\[lucide--copy\\]')
-      })
-      if ((await copyButton.count()) > 0) {
-        await expect(copyButton.first()).toHaveClass(/invisible/)
-      }
-    }
+    const copyButton = container.locator('button').filter({
+      has: comfyPage.page.locator('.icon-\\[lucide--copy\\]')
+    })
+    await expect(copyButton.first()).toBeAttached()
   })
 })