Add WASM feature tests: font enum, text decor, bitmap mask, regions

New test apps and E2E tests:
- fontenum: Font enumeration via Local Font Access API (180 fonts)
- textdecor: Text underline/strikethrough decorations
- bitmask: wxMask bitmap transparency with color keys
- regions: Non-rectangular region clipping (union, subtract, complex shapes)

Updates:
- playwright.config.ts: Add local-fonts permission
- WHATWORKS.md: Document implemented features, update test counts
- Makefile.wasm: Add build targets for new test apps

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/e2e/regions.spec.ts

@@ -0,0 +1,17 @@
+// Region Clipping Tests - Non-rectangular clipping regions
+import { test, expect, tryLoadApp } from './utils/fixtures';
+
+test.describe('Region Clipping Tests', () => {
+
+  test('Region clipping renders correctly', async ({ page, testLogger }) => {
+    await page.goto('/standalone/regions/regions_test.html');
+    const loaded = await tryLoadApp(page);
+
+    await page.waitForTimeout(500);
+    await page.screenshot({ path: 'test-results/regions.png', fullPage: true });
+
+    expect(loaded, 'Region clipping app should load').toBe(true);
+    expect(testLogger.errors.filter(e => !e.includes('favicon'))).toHaveLength(0);
+  });
+
+});