Implement LED test effects with proper cleanup

- Add LED test effects page with multiple test patterns (solid colors, rainbow, breathing, flowing)
- Implement Rust backend for LED test effects with proper task management
- Add automatic cleanup when navigating away from test page using onCleanup hook
- Ensure test mode is properly disabled to resume normal ambient lighting
- Clean up debug logging for production readiness
- Fix menu navigation issues by using SolidJS router components

Features:
- Multiple test patterns: solid colors, rainbow cycle, breathing effect, flowing lights
- Configurable animation speed
- Automatic cleanup prevents LED conflicts with ambient lighting
- Responsive UI with proper error handling

src-tauri/Cargo.toml

@@ -23,6 +23,7 @@ core-graphics = "0.22.3"
 display-info = "0.4.1"
 anyhow = "1.0.69"
 tokio = {version = "1.26.0", features = ["full"] }
+tokio-util = "0.7"
 paris = { version = "1.5", features = ["timestamps", "macros"] }
 log = "0.4.17"
 env_logger = "0.10.0"