feat(desktop): relocate main window help for macOS titlebar #6327

Job	Run time
Format (Cargo)	11s
Typecheck	1m 28s
Format (Biome)	7s
Lint (Biome)	11s
Detect Changes	6s
Clippy (aarch64-apple-darwin, macos-latest)	2m 7s
Clippy (x86_64-pc-windows-msvc, windows-latest)	5m 0s
Rust cache (x86_64-apple-darwin, macos-latest)	4m 21s
Rust cache (aarch64-apple-darwin, macos-latest)	4m 51s
Rust cache (x86_64-pc-windows-msvc, windows-latest)	9m 46s
Build Desktop	0s
Verify Tauri plugin versions	0s
	28m 8s

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