Shared QML components

[vhrabar]

Description

The settings pages are dozens of near-identical rows. Build the row vocabulary once, driven by the configschema metadata, so pages stay declarative and consistent.

Tasks

• ToggleRow.qml: label + description + Switch
• SliderRow.qml: label + description + Slider + value readout, honouring schema min/max/step
• SelectRow.qml: label + description + ComboBox bound to a schema enum
• SectionHeading.qml
• StatusCard.qml: status tile (state dot + title + detail), used by the Dashboard
• All colours from Kirigami.Theme; excepte Teal acc,, so system dark/light and accent are inherited (GUI scaffolding and meson integration #22)
• Register under qrc:/qml/components/ in secureeye-gui.qrc

Acceptance criteria

• Switching the system colour scheme att runtime restyles every component with no restart
• Each component renders correctly at both compact and expanded drawer widths
• No component reaches back into ConfigStore directly, values arrive as properties