wasm: validate kicad hi-dpi scaling

tests/e2e/retinascale.spec.ts

@@ -0,0 +1,16 @@
+// Retina/HiDPI Scaling Test - Verifies bitmaps render at correct logical pixel sizes
+import { test, expect, tryLoadApp } from './utils/fixtures';
+
+test.describe('Retina Scale Tests', () => {
+
+  test('Bitmap icons render at correct logical size', async ({ page, testLogger }) => {
+    await page.goto('/standalone/retinascale/retinascale_test.html');
+    const loaded = await tryLoadApp(page);
+
+    await page.screenshot({ path: 'test-results/retinascale-01-loaded.png', fullPage: true });
+
+    expect(loaded, 'Retina scale test app should load').toBe(true);
+    expect(testLogger.errors.filter(e => !e.includes('favicon'))).toHaveLength(0);
+  });
+
+});