Test/366 js feature scripts unit tests

[suraj-yadav0]

Closes #366

Adds automated QML test coverage for JavaScript feature scripts and utility helpers:

• qml/app/navigation/NavigationRoutes.js: Route definitions, route path resolution, and page URLs.
• qml/features/dashboard/js/chartUtils.js: Chart data transforms, percentages, summaries, and sorting.
• qml/features/dashboard/js/chartWorker.js: Worker message processing, dataset filtering, and async sorting.
• qml/features/tasks/js/taskFormUtils.js: Task form validation rules, duration math, and save data mapping.
• qml/components/richtext/js/html-sanitizer.js: HTML tag sanitization, color normalization, and validation.
• qml/components/richtext/js/squire-qtwebengine-bridge.js: WebEngine messaging, chunking, and reply handling.

All 487 QML unit tests and 54 Python unit tests pass.