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/playwright.config.ts

@@ -15,8 +15,8 @@ export default defineConfig({
   use: {
     baseURL: 'http://localhost:8080',
     trace: 'on-first-retry',
-    // Grant clipboard permissions for clipboard tests
-    permissions: ['clipboard-read', 'clipboard-write'],
+    // Grant clipboard and font permissions for tests
+    permissions: ['clipboard-read', 'clipboard-write', 'local-fonts'],
   },
 
   projects: [