E2E 스모크: 그룹 드래그 스냅 델타 동일 적용 검증 추가

tests/e2e/wysiwyg-group-drag.e2e.ts

@@ -0,0 +1,58 @@
+import { test, expect } from '@playwright/test'
+
+const wysiwygUrl = '/en/wysiwyg'
+
+function snap8(v: number) { return Math.round(v / 8) * 8 }
+
+async function getLefts(page: import('@playwright/test').Page) {
+  const els = page.locator('[data-testid^="obj-text-"]')
+  const count = await els.count()
+  const results: number[] = []
+  for (let i = 0; i < count; i++) {
+    const style = await els.nth(i).evaluate((n) => (n as HTMLElement).style.left || '0')
+    results.push(parseInt(style || '0', 10))
+  }
+  return results
+}
+
+test.describe('WYSIWYG - Group drag', () => {
+  test('marquee select two items and drag group by 16px on X (snaps to grid)', async ({ page }) => {
+    await page.goto(wysiwygUrl)
+
+    const canvas = page.getByTestId('wysiwyg-canvas')
+    await expect(canvas).toBeVisible()
+
+    const addText = page.getByRole('button', { name: /^Add Text$/i })
+    await addText.click()
+    await addText.click()
+
+    // Marquee select both
+    const box = await canvas.boundingBox()
+    if (!box) throw new Error('canvas not found')
+    await page.mouse.move(box.x + 40, box.y + 40)
+    await page.mouse.down()
+    await page.mouse.move(box.x + 240, box.y + 160)
+    await page.mouse.up()
+
+    const live = page.getByTestId('aria-live')
+    await expect(live).toContainText(/선택\s*2개/)
+
+    const before = await getLefts(page)
+
+    // Drag one of selected (the second) by +16 on X
+    const target = page.locator('[data-testid^="obj-text-"]').nth(1)
+    const tbox = await target.boundingBox()
+    if (!tbox) throw new Error('target not found')
+    await page.mouse.move(tbox.x + 5, tbox.y + 5)
+    await page.mouse.down()
+    await page.mouse.move(tbox.x + 21, tbox.y + 5) // ~+16 on X
+    await page.mouse.up()
+
+    const after = await getLefts(page)
+    // Expect both moved by same snapped delta
+    const expectedDx = snap8(before[1] + 16) - before[1]
+    expect(after.length).toBeGreaterThanOrEqual(2)
+    expect(after[0]).toBe(before[0] + expectedDx)
+    expect(after[1]).toBe(before[1] + expectedDx)
+  })
+})