QML/UI testing infrastructure

[PyXiion]

Origin of idea

Five QML files (ModList.qml 500+ lines, Header.qml 260+ lines, Sidebar.qml, TimeAnalytics.qml, IconRail.qml) have zero automated tests. Complex behavior (drag reorder, keyboard nav, search filter) is verified manually.

Suggestion / proposed solution

Set up QtQuickTest / QtTest for QML unit testing:

1. Create tst_*.qml test files alongside components
2. Use TestCase to test model interactions, signal emissions, visual states
3. Run via qmltestrunner or pytest plugin
4. Add QML tests to just check / CI
   pytest-qt is already in dev deps — add pytest-qml or write a custom runner using QQuickView.

Alternatives considered

No response

Additional context

No response