Refactor test logging into shared utilities

- Extract common logging code to tests/e2e/utils/
  - fixtures.ts: Playwright fixture with automatic log capture
  - test-utils.ts: Logging utilities and helper functions
- Each test now automatically captures:
  - Console logs with timestamps and log levels
  - Page errors with full stack traces
- Log files written per test to tests/logs/
  - <test-name>.log for all console output
  - <test-name>.errors.log only when errors occur
- Update all 13 spec files to use shared fixtures
- Update README with test structure and logging docs
- Net reduction of ~700 lines by removing duplicated code

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

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

tests/README.md

@@ -13,7 +13,7 @@ Playwright tests for verifying the wxWidgets WASM port.
 ../scripts/build-wasm-test.sh
 ```
 
-This builds `wasm-app/minimal_test.{html,js,wasm}`.
+This builds `wasm-app/minimal_test.{html,js,wasm}` and standalone test apps.
 
 ## Running Tests
 
@@ -22,6 +22,61 @@ npm install
 npm test
 ```
 
+To run specific tests:
+```bash
+npx playwright test menu.spec.ts        # Run menu tests only
+npx playwright test --grep "wxTimer"    # Run tests matching pattern
+```
+
+## Test Structure
+
+```
+tests/
+├── e2e/                    # Playwright test specs
+│   ├── utils/              # Shared test utilities
+│   │   ├── fixtures.ts     # Playwright fixtures with auto-logging
+│   │   └── test-utils.ts   # Logging and helper functions
+│   ├── menu.spec.ts        # wxMenuBar tests
+│   ├── timer.spec.ts       # wxTimer tests
+│   ├── dialog.spec.ts      # wxDialog/wxMessageBox tests
+│   ├── tree.spec.ts        # wxTreeCtrl tests
+│   ├── grid.spec.ts        # wxGrid/wxSpinCtrl/wxSearchCtrl tests
+│   ├── opengl.spec.ts      # OpenGL tab tests
+│   ├── wxwidgets.spec.ts   # Comprehensive UI interaction tests
+│   └── ...
+├── logs/                   # Test logs (auto-generated)
+├── test-results/           # Screenshots (auto-generated)
+├── baseline-screenshots/   # Reference screenshots for comparison
+├── wasm-app/              # Built WASM test applications
+│   ├── minimal_test.html  # Main test app
+│   └── standalone/        # Individual component test apps
+└── playwright.config.ts   # Playwright configuration
+```
+
+## Logging
+
+Each test automatically captures:
+- Console logs with timestamps and log levels
+- Page errors with full stack traces
+
+Log files are written to `logs/` after each test:
+- `<test-name>.log` - All console output
+- `<test-name>.errors.log` - Errors only (created if errors occurred)
+
+Example log format:
+```
+[2025-11-29T19:39:42.165Z] [LOG] [EVENT] Application started
+[2025-11-29T19:39:42.733Z] [WARNING] GPU stall due to ReadPixels
+[2025-11-29T19:39:42.801Z] [ERROR] Some error message
+```
+
+## Screenshots
+
+Tests capture screenshots to `test-results/`. Compare against baselines:
+```bash
+../scripts/compare-screenshots.sh
+```
+
 ## Viewing the App Directly
 
 Start a local server in the wasm-app directory:
@@ -41,3 +96,26 @@ python3 -m http.server 8000
 ```
 
 Then open http://localhost:8000/minimal_test.html
+
+## Test Categories
+
+| Spec File | Tests | Description |
+|-----------|-------|-------------|
+| `wxwidgets.spec.ts` | Comprehensive | Full UI interaction, stability, OpenGL |
+| `menu.spec.ts` | wxMenuBar | Menu bar visibility and interactions |
+| `timer.spec.ts` | wxTimer | Timer start/stop/reset functionality |
+| `dialog.spec.ts` | wxDialog | Message boxes and custom dialogs |
+| `tree.spec.ts` | wxTreeCtrl | Tree control with expand/collapse |
+| `grid.spec.ts` | wxGrid | Grid, SpinCtrl, SearchCtrl |
+| `opengl.spec.ts` | OpenGL | GL tests (immediate mode, vertex arrays) |
+| `aui.spec.ts` | wxAuiManager | Dockable panels |
+| `clipboard.spec.ts` | wxClipboard | Copy/paste operations |
+| `filedialog.spec.ts` | wxFileDialog | File open/save dialogs |
+| `layout.spec.ts` | wxSplitter | Splitter and scrolled windows |
+| `toolbar.spec.ts` | wxToolBar | Toolbar buttons and status bar |
+
+## Known Issues
+
+- **Timer tests**: May fail due to timing sensitivity
+- **Tree tests**: Button click positions may vary
+- **wxGrid**: Not fully implemented (expected failures marked with `test.fail`)