fix(desktop): streamline macOS permission requests and onboarding #6395

Job	Run time
Format (Biome)	10s
Lint (Biome)	15s
Typecheck	1m 29s
Format (Cargo)	18s
Detect Changes	9s
Clippy (x86_64-pc-windows-msvc, windows-latest)	2m 4s
Clippy (aarch64-apple-darwin, macos-latest)	1m 16s
Verify Tauri plugin versions	-1s
Rust cache	-1s
Build Desktop	-1s
	5m 38s

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