feat(apple): storage screen, About content, and fixes

- Settings: add Storage screen (size breakdown + delete-all-transfers) and
  expand About (what it is/isn't, privacy & security, license/source)
- Move Report a bug to a toolbar sheet (cancel-only unless empty)
- Send progress: derive the list-row bar from receiver delivery status so it
  clears once every receiver completes
- Fixes: iPad orientations, onChange(of:) iOS 17 API, weak-self captures,
  invalid SF Symbol, macOS bug-report form labels; bump core build target to
  match the app (18.2/15.0)

apple/VniDrop/Features/Receive/ReceiveModel.swift

@@ -176,7 +176,7 @@ final class ReceiveModel: ObservableObject {
 					text: .resource("receive_completed"),
 					tone: .success,
 					actionLabel: canReveal ? .resource("button_show_in_files") : nil,
-					onAction: canReveal ? { [weak self] in self?.revealReceiveFolder(folder) } : nil
+					onAction: canReveal ? { self.revealReceiveFolder(folder) } : nil
 				))
 			case .failure(let error):
 				if error.isUserCancellation {
@@ -193,7 +193,7 @@ final class ReceiveModel: ObservableObject {
 					text: uiText,
 					tone: .error,
 					actionLabel: .resource("button_retry"),
-					onAction: { [weak self] in self?.receive() }
+					onAction: { self.receive() }
 				))
 			}
 		}

apple/VniDrop/Features/Receive/ReceiveScreen.swift

@@ -17,7 +17,7 @@ struct ReceiveScreen: View {
 		NavigationStack {
 			Group {
 				if transfers.isEmpty {
-					ScrollView { emptyState }
+					emptyState
 				} else {
 					history
 				}
@@ -88,11 +88,11 @@ struct ReceiveScreen: View {
 	}
 
 	private var emptyState: some View {
-		EmptyStateView(
-			systemImage: "tray.and.arrow.down",
-			title: String(localized: "receive_empty_title"),
-			message: String(localized: "receive_empty_body")
-		) {
+		ContentUnavailableView {
+			Label(String(localized: "receive_empty_title"), systemImage: "tray.and.arrow.down")
+		} description: {
+			Text(LocalizedStringKey("receive_empty_body"))
+		} actions: {
 			Button(action: model.openAcquisition) {
 				Label(String(localized: "button_receive_files"), systemImage: "plus")
 			}