Fix: Resolve deprecated QML syntax in main.qml

[raexera]

qrc:/qt/qml/hpa/qml/main.qml:97:17: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead function onFoo(<arguments>) { ... }

This PR addresses deprecated usage of Connections in main.qml where implicit onFoo properties were used. The fix applies the recommended syntax for defining these connections as proper functions.

[vaxerski]

tanks!