Update depends and Guix for QML/Qt Quick builds

[johnny9]

Parent: #40

Goal

Make the depends and Guix build paths produce a Qt stack capable of building and running the QML/Qt Quick application.

Scope

• Extend depends Qt packaging beyond the legacy Widgets requirements to include the Qt Declarative/QML pieces used by the app.
• Include required modules such as Qml, Quick, QuickControls2, Dialogs, Layouts, Labs Settings, WorkerScript, and required host tools/plugins.
• Ensure static builds import the necessary QML and platform plugins deterministically.
• Add or update Guix build scripts/manifests so release-style builds can produce the QML app.
• Verify Linux first, then track Windows/macOS gaps if they need separate follow-ups.

Acceptance Criteria

• A depends-based build can configure and build the QML target without relying on distro QML packages.
• Guix can build the QML app through the intended release path.
• Required QML modules/plugins are captured explicitly, not discovered accidentally from the host.
• Remaining platform-specific static-build gaps are filed as child issues or documented deferrals.