feat: add design system platform

tests/e2e/accessibility.spec.js

@@ -40,3 +40,19 @@ test("@a11y reduced-motion policy disables long animation", async ({ page }) =>
     .evaluate((body) => getComputedStyle(body).animationDuration);
   expect(["0s", "0.00001s", "1e-05s"]).toContain(duration);
 });
+
+test("@a11y opened design-system dialog has no blocking violations", async ({
+  page,
+}) => {
+  await page.goto("/examples/ui");
+  await page.getByRole("button", { name: "모달 열기" }).click();
+  const results = await new AxeBuilder({ page })
+    .include(".ui-dialog")
+    .withTags(["wcag2a", "wcag2aa", "wcag21a", "wcag21aa"])
+    .analyze();
+  expect(
+    results.violations.filter((violation) =>
+      ["critical", "serious"].includes(violation.impact ?? ""),
+    ),
+  ).toEqual([]);
+});