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Bogdan Chadkin 5fe9364cb1 Improve units in style panel (#735)
Ref https://github.com/webstudio-is/webstudio-designer/issues/366

- generate grouped units for non length values
- show unit select when initial unitless

So we get all 3 points from the issue

- all properties has only supported units
- hidden but supported units still can be entered
- unsupported values are validated

<img width="243" alt="Screenshot 2023-01-04 at 14 12 29"
src="https://user-images.githubusercontent.com/5635476/210546684-ca696096-f78c-445f-bbc3-04db7326239b.png">
<img width="224" alt="Screenshot 2023-01-04 at 14 14 54"
src="https://user-images.githubusercontent.com/5635476/210546689-396c7d42-e6f0-42a9-869c-7b231baa3d71.png">
2023-01-04 18:20:15 +03:00
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