Fix reconnect 'No Mac found' + add real demo notification

ConnectFlowView: Replace the incremental fetchChanges() polling loop in
begin() with forceFetchAll(). After disconnectCurrentMac() clears local
stores, the CKSyncEngine still holds an old server token, so incremental
fetches return zero records (Mac's MacStatus was already 'seen'). Calling
forceFetchAll() wipes the token, reinitialises the engine, and awaits a
full CloudKit re-fetch before returning — so byMacId is already populated
by the time we check. A small 3-iteration fallback loop handles the case
where the Mac published its heartbeat after our initial import window.

DemoView: The 'Preview a notification' button now fires a real
UNNotificationRequest with a 2-second trigger instead of showing a static
in-app mock sheet. The user can background the app and see the actual
system banner, giving a genuine preview of what agent alerts look like.
Permission flow: authorized -> schedule; notDetermined -> request then
schedule if granted; denied -> fall back to existing visual mock sheet.

Author: katipally

DoomCoderCompanion/DoomCoderCompanion/UI/ConnectFlowView.swift

@@ -161,11 +161,19 @@ struct ConnectFlowView: View {
         let available = await isiCloudAvailable()
         guard available else { step = .icloudNeeded; return }
         step = .searching
-        // Poll a few times so a freshly-launched Mac has time to publish.
-        for _ in 0..<6 {
-            await CompanionSyncEngine.shared.fetchChanges()
+        // After disconnect, the sync engine holds a stale incremental token that
+        // causes fetchChanges() to return zero records (the Mac's MacStatus was
+        // already "seen" before the disconnect). forceFetchAll() wipes the token
+        // and re-initialises the engine, then awaits a full CloudKit re-fetch so
+        // all current records (including the Mac heartbeat) arrive via the
+        // delegate before this call returns.
+        await CompanionSyncEngine.shared.forceFetchAll()
+        // Fallback: if the Mac published its heartbeat after our initial import
+        // window (e.g. just restarted), poll a couple more times.
+        for _ in 0..<3 {
             if !macStore.byMacId.isEmpty { break }
             try? await Task.sleep(for: .seconds(2))
+            await CompanionSyncEngine.shared.fetchChanges()
         }
         switch macStore.byMacId.count {
         case 0:

DoomCoderCompanion/DoomCoderCompanion/UI/DemoView.swift

@@ -7,6 +7,7 @@
 // Everything here is local sample data; nothing is written to CloudKit.
 
 import SwiftUI
+import UserNotifications
 import DoomCoderCore
 
 struct DemoView: View {
@@ -45,7 +46,7 @@ struct DemoView: View {
                 section(title: "Notifications", subtitle: "See how an agent alert looks on your device.") {
                     Button {
                         Haptics.tap()
-                        showNotificationPreview = true
+                        Task { await previewNotification() }
                     } label: {
                         Label("Preview a notification", systemImage: "bell.badge")
                             .font(.headline)
@@ -118,6 +119,39 @@ struct DemoView: View {
         .frame(maxWidth: .infinity, alignment: .leading)
     }
 
+    // MARK: - Notification preview
+
+    private func previewNotification() async {
+        let center = UNUserNotificationCenter.current()
+        let settings = await center.notificationSettings()
+        switch settings.authorizationStatus {
+        case .authorized, .provisional, .ephemeral:
+            scheduleDemoLocalNotification()
+        case .notDetermined:
+            let granted = (try? await center.requestAuthorization(options: [.alert, .sound])) ?? false
+            if granted { scheduleDemoLocalNotification() } else { showNotificationPreview = true }
+        default:
+            // Permission denied — fall back to the in-app visual preview.
+            showNotificationPreview = true
+        }
+    }
+
+    /// Schedules a real local notification with a 2-second delay so the user can
+    /// background the app and see the system banner appear on their device.
+    private func scheduleDemoLocalNotification() {
+        let content = UNMutableNotificationContent()
+        content.title = "Claude needs approval"
+        content.body = "Wants to run `git push` in ~/Projects/api"
+        content.sound = .default
+        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 2, repeats: false)
+        let request = UNNotificationRequest(
+            identifier: "doomcoder.demo.\(UUID().uuidString)",
+            content: content,
+            trigger: trigger
+        )
+        UNUserNotificationCenter.current().add(request)
+    }
+
     // MARK: - Sample data
 
     struct SampleAgent {