gpui: Use local coordinates & add `scale` property #43213

Job	Run time
(Linux) Build Remote Server	1m 55s
(Linux) Run Clippy and tests	13m 29s
(macOS) Run Clippy and tests	7m 46s
Check Postgres and Protobuf migrations, mergability	13s
Check formatting and spelling	27s
(Windows) Run Clippy and tests	12m 33s
Create a macOS bundle	0s
Linux x86_x64 release bundle	0s
Linux arm64 release bundle	0s
Auto release preview	0s
	36m 23s

Provide feedback