fix(desktop): match DMG background resolution to Finder layout #6128

Job	Run time
Build Impact	19s
Shell Deploy Scripts	11s
CLI Tests (windows-latest)	10m 46s
Rust Build Check (ubuntu-latest)	17m 2s
Rust Build Check (windows-latest)	29m 39s
Frontend Build	9m 23s
CLI Tests (ubuntu-latest)	9m 28s
Rust Build Check (macos-15)	23m 35s
CLI Tests (macos-15)	9m 25s
Impact-selected Linux / Relay Contract	0s
DSH Profile Packaging (windows-latest)	0s
Rust / CLI Validation	8s
	1h 49m 56s

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