Configure SST for git branches + move all preview deployments to staging #3945

Job	Run time
Build Desktop (aarch64-apple-darwin, macos-latest)	5m 27s
Lint (Biome)	11s
Build Desktop (x86_64-pc-windows-msvc, windows-latest)	7m 11s
Format (Biome)	7s
Detect Changes	5s
Typecheck	1m 11s
Format (Cargo)	13s
Verify Tauri plugin versions	0s
Clippy	-1s
	14m 24s

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