feat(apple): send files to a remembered device

Adds the Send files action to the device detail, routing the picked
selection through sendToContact.

Rather than a second picker path, sharePickedFiles now takes a
ShareDestination, so the macOS security-scoped access handling covers both
routes. A contact destination carries no access policy, matching the core's
rule that an offer share is never public.

apple/VniDrop/App/AppGraph.swift

@@ -31,7 +31,8 @@ final class AppGraph: ObservableObject {
 		self.contactsModel = ContactsModel(
 			repository: coreRepository,
 			messages: messages,
-			preferences: preferencesRepository
+			preferences: preferencesRepository,
+			fileSystemService: dependencies.fileSystemService
 		)
 		self.approvalCoordinator = ApprovalCoordinator(
 			repository: coreRepository,