feat(apple): add context menus to Send and Receive rows

Send rows get a context menu that acts inline without navigating: Share opens the
share panel (QR + delivery) over the list via a dedicated sheet host, Stop sharing
(active shares) and Delete transfer run in place, the latter through a new id-based
SendModel.deleteTransfer and a list-level confirmation alert. Receive rows get a
Delete action mirroring swipe-to-delete (handy on macOS).

apple/VniDrop/Features/Receive/ReceiveScreen.swift

@@ -79,6 +79,15 @@ struct ReceiveScreen: View {
 							}
 						}
 					}
+					.contextMenu {
+						if transfer.status.isTerminalReceiveHistory {
+							Button(role: .destructive) {
+								model.requestDeleteHistoryItem(transfer.transferId)
+							} label: {
+								Label(String(localized: L10n.Button.deleteTransfer), systemSymbol: .trash)
+							}
+						}
+					}
 				}
 			} header: {
 				Text(String(localized: L10n.Receive.historyTitle))