fix(ios): improve fleet overview and app identity

- Show stable group health in a fixed 2x2 metric grid
- Add link-chain state to fleet cards and parse hardware/control/SIM/cellular
- Replace the wrapped icon with a full-bleed app icon
- Bump the IPA build number

apps/ios/Sources/MultiSimAdmin/Features/Device/DeviceViewModel.swift

@@ -5,13 +5,16 @@ final class DeviceViewModel: ObservableObject {
     @Published var snapshot: DeviceSnapshot?
     @Published var isLoading = false
     @Published var errorMessage: String?
+    @Published private(set) var connectionStatus: ConnectionStatus = .unknown
 
     let instance: Instance
     private let service: DeviceService
+    private let probe: ConnectionProbe?
 
-    init(instance: Instance, service: DeviceService) {
+    init(instance: Instance, service: DeviceService, probe: ConnectionProbe? = nil) {
         self.instance = instance
         self.service = service
+        self.probe = probe
     }
 
     func refresh() async {
@@ -24,6 +27,13 @@ final class DeviceViewModel: ObservableObject {
         } catch {
             errorMessage = "无法加载设备数据。"
         }
+        guard let probe else {
+            connectionStatus = .offline
+            isLoading = false
+            return
+        }
+        let result = try? await probe.test(instance)
+        connectionStatus = result?.status ?? .offline
         isLoading = false
     }
 }