Add `VirtualHorizon` widget #1163

Job	Run time
Test	1m 6s
deploy-flatpak	9m 10s
deploy-electron (macos-latest, macos, dmg)	5m 0s
deploy-page	34s
deploy-electron (ubuntu-latest, linux, AppImage)	3m 50s
deploy-blueos-extension	50s
	20m 30s

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