Add `VirtualHorizon` widget #1164

Job	Run time
Test	1m 29s
deploy-page	38s
deploy-electron (macos-latest, macos, dmg)	4m 46s
deploy-blueos-extension	1m 0s
deploy-electron (ubuntu-latest, linux, AppImage)	3m 35s
deploy-flatpak	8m 14s
	19m 42s

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