- Add main_content.rml for sandbox-test app with test cards for Timer, JSON, Crypto, Storage
- Add sandbox test functions to shell.lua (testSandboxTimer, testSandboxJSON, etc.)
- Register sandbox-test in builtin_ids and shellNavigateTo paths
- Add sandbox-test styles to shell.rml
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Rename test-apps to base-apps with proper manifest.json for each app
- Add is_system_app flag to app discovery and Lua API
- Fix icon path resolution for /system/icons/ paths
- Add layout.lua and layout.rcss for reusable UI components
- Update home screen to dynamically load all apps from manifests
- Update all app RML files to use layout components
- Comprehensive testing framework documentation with JSON action format
- Add tests/ directory structure for automated UI testing
