desktop: Add `Controls > Step Once`, for frame-by-frame stepping #26343

Job	Run time
Paths filter	7s
Check dependencies	1m 33s
Lints with Rust stable	4m 27s
Test Rust stable / ubuntu-24.04	4m 50s
Lints with Rust beta	4m 27s
Test Rust ${{ matrix.rust_version }} / ${{ matrix.os }}	0s
Lints with Rust nightly	4m 8s
Test Rust stable / windows-latest	11m 52s
Test Rust stable / macos-14	3m 14s
Test Rust nightly / ubuntu-24.04	8m 56s
Test Rust beta / ubuntu-24.04	4m 37s
	48m 11s

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