Unit tests for JavaScript Feature Scripts and Utility Helpers #366

Part of #357

Add unit test coverage for feature-specific scripts, navigation routes, chart calculators, and sanitizers.

Target Modules

• qml/app/navigation/NavigationRoutes.js: Route definitions, route path resolution, active tab mapping
• qml/features/dashboard/js/chartUtils.js: Chart data transforms, coordinate mappings, series aggregations, point calculations
• qml/features/dashboard/js/chartWorker.js: Worker message processing, data parsing, computation helpers
• qml/features/tasks/js/taskFormUtils.js: Task form validation rules, due date math, status/stage mappings
• qml/components/richtext/js/html-sanitizer.js: HTML tag sanitization, allowed tag filtering, XSS prevention
• qml/components/richtext/js/squire-qtwebengine-bridge.js: WebEngine message passing, command formatting

Implementation

• Can be tested via Qt Quick Test (TestCase importing .js files via .import) or a headless test harness.