fix(ble): restore peripheral state and keep advertising

IrisCompanion/iris/irisApp.swift

@@ -9,11 +9,13 @@ import SwiftUI
 
 @main
 struct irisApp: App {
+    @Environment(\.scenePhase) private var scenePhase
     @StateObject private var ble: BlePeripheralManager
     @StateObject private var orchestrator: ContextOrchestrator
 
     init() {
         let bleManager = BlePeripheralManager()
+        bleManager.start()
         _ble = StateObject(wrappedValue: bleManager)
         _orchestrator = StateObject(wrappedValue: ContextOrchestrator(ble: bleManager))
     }
@@ -23,6 +25,11 @@ struct irisApp: App {
             ContentView()
                 .environmentObject(ble)
                 .environmentObject(orchestrator)
+                .onChange(of: scenePhase) { phase in
+                    if phase == .active || phase == .background {
+                        ble.start()
+                    }
+                }
         }
     }
 }