fix(a11y): update tests for GlassNumberStepper and increase button size

- Update accessibility test to use data-testid instead of spinbutton role
  (GlassNumberStepper uses type="text" with inputMode="numeric")
- Increase Original theme button width from w-10 to w-12 (48px)
  to meet WCAG touch target minimum of 44px

Author: ryota-murakami

components/ui/GlassNumberStepper.tsx

@@ -268,7 +268,7 @@ export const GlassNumberStepper = memo(function GlassNumberStepper({
           aria-label={`Decrease ${label || 'value'}`}
           className={`
             flex items-center justify-center
-            w-10 h-14
+            w-12 h-14
             bg-bg-secondary
             text-text-primary
             transition-colors duration-200
@@ -316,7 +316,7 @@ export const GlassNumberStepper = memo(function GlassNumberStepper({
           aria-label={`Increase ${label || 'value'}`}
           className={`
             flex items-center justify-center
-            w-10 h-14
+            w-12 h-14
             bg-bg-secondary
             text-text-primary
             transition-colors duration-200

e2e/accessibility.spec.ts

@@ -67,11 +67,17 @@ test.describe('Accessibility Tests', () => {
     await page.goto('/en')
 
     // Check for minute and second inputs with labels
-    const minuteInput = page.getByRole('spinbutton', { name: /minutes/i })
-    const secondInput = page.getByRole('spinbutton', { name: /seconds/i })
+    // GlassNumberStepper uses type="text" with inputMode="numeric" instead of type="number"
+    // so we use data-testid selectors instead of spinbutton role
+    const minuteInput = page.getByTestId('time-input-minutes')
+    const secondInput = page.getByTestId('time-input-seconds')
 
     await expect(minuteInput).toBeVisible()
     await expect(secondInput).toBeVisible()
+
+    // Verify aria-label is set for accessibility
+    await expect(minuteInput).toHaveAttribute('aria-label', 'Minutes')
+    await expect(secondInput).toHaveAttribute('aria-label', 'Seconds')
   })
 
   test('color contrast meets WCAG AA standards', async ({ page }) => {