PASS: Six wallpapers with Neon Street Court default
PASS: Rotation defaults On and preserves the first sign-in scene
PASS: First startup retains the requested default
PASS: Rotation advances in sequence to option 0
PASS: Rotation advances in sequence to option 1
PASS: Rotation advances in sequence to option 2
PASS: Rotation advances in sequence to option 3
PASS: Rotation advances in sequence to option 4
PASS: Rotation advances in sequence to option 5
PASS: Off performs no wallpaper change
PASS: Off removes only the owned startup value
PASS: Manual choice becomes the base for the next startup
PASS: Repeated On/Off preserves the first original once
PASS: Missing next artwork aborts rotation
PASS: Missing artwork does not advance the saved index
PASS: Out-of-range state is rejected
PASS: Backup failure aborts a rotation preference change
PASS: Backup failure occurs before registry mutation
PASS: Upgrade retires previous owned hiding of another system icon
PASS: Upgrade preserves a system-icon choice changed by the user
PASS: Existing custom shortcut is preserved
PASS: Existing managed-name shortcut is not overwritten
PASS: Existing Edge icon remains on the desktop
PASS: Previously archived personal shortcut recovers on upgrade
PASS: Desktop documents and folders are untouched
PASS: Missing app shortcuts are added
PASS: Recovered legacy shortcut is retired from pending recovery
PASS: Repeated synchronization preserves current icons
PASS: Desktop profile only shows Recycle Bin in both Explorer views
PASS: Recycle Bin visible readback
PASS: Recycle Bin visible readback
PASS: Repeated desktop apply retains first icon originals
PASS: Repeated Recycle Bin enable preserves originally hidden state for recovery
PASS: Shortcut recovery excludes non-shortcut files
PASS: Shortcut recovery cannot target another folder
PASS: New installation preserves shared icons without archiving or deleting
PASS: Shared recovery refuses to overwrite a newer shortcut
PASS: Newer shared shortcut remains intact
PASS: Legacy shared shortcut restores original bytes
PASS: Legacy shared recovery is durably marked complete
PASS: Tampered shared shortcut backup is refused
PASS: Existing shared browser link is not duplicated on personal desktop
PASS: Restored profile cannot be reactivated by a stale startup invocation
All 43 wallpaper/desktop checks passed (registry, shell and wallpaper APIs mocked).
