Fix Mac offline UI consistency: red dot, correct status line, forceFetchAll on Try Again

MacControlCard: Add isOffline parameter (computed from >10 min staleness,
same threshold as MacReachabilityBanner). When offline:
  - Status dot turns red instead of gray
  - Status line shows 'Mac unreachable, commands will apply on reconnect'
    instead of the stale 'Idle, sleeps when agents finish' message

MacReachabilityBanner: 'Try again' now calls forceFetchAll() when the Mac
is in .offline state. Incremental fetchChanges() is useless here because
the stale heartbeat was already seen by the sync engine; forceFetchAll()
wipes the token and does a full re-fetch so the Mac's record is returned
even if it has not changed since the last successful sync.

HomeView: Pull-to-refresh also uses forceFetchAll() so a user manually
refreshing the home screen when the Mac is unreachable gets a real re-fetch.

SettingsView: Rename 'Last sync' to 'iCloud sync' in the About section
to clearly distinguish it from 'Last seen' (Mac heartbeat age) in the
Connection section. 'iCloud sync: 51s' next to 'Last seen: 10 min' was
misleading -- it looked like everything was fine.

DemoView: Pass isOffline: false to MacControlCard (demo is always reachable).

Author: katipally

DoomCoderCompanion/DoomCoderCompanion/UI/DemoView.swift

@@ -61,6 +61,7 @@ struct DemoView: View {
                         macName: "Sample Mac",
                         lastSeen: nil,
                         isDemo: true,
+                        isOffline: false,
                         mode: demoMode,
                         screen: demoScreen,
                         timerHours: demoTimer,

DoomCoderCompanion/DoomCoderCompanion/UI/HomeView.swift

@@ -29,7 +29,7 @@ struct HomeView: View {
         .background(Color(.systemGroupedBackground))
         .navigationTitle("DoomCoder")
         .refreshable {
-            await CompanionSyncEngine.shared.fetchChanges()
+            await CompanionSyncEngine.shared.forceFetchAll()
         }
         .sheet(isPresented: $showConnect) {
             ConnectFlowView(onFinished: {})

DoomCoderCompanion/DoomCoderCompanion/UI/MacControlView.swift

@@ -21,6 +21,7 @@ struct MacControlCard: View {
     let macName: String
     let lastSeen: Date?
     let isDemo: Bool
+    let isOffline: Bool       // true when Mac heartbeat is >10 min stale
 
     let mode: KeepAwakeMode
     let screen: ScreenMode
@@ -100,7 +101,7 @@ struct MacControlCard: View {
             }
             Spacer()
             Circle()
-                .fill(awakeActive ? Color.green : Color.secondary.opacity(0.4))
+                .fill(isOffline ? Color.red : (awakeActive ? Color.green : Color.secondary.opacity(0.4)))
                 .frame(width: 10, height: 10)
                 .accessibilityHidden(true)
         }
@@ -146,6 +147,10 @@ struct MacControlCard: View {
             if waiting {
                 ProgressView().controlSize(.small)
                 Text("Sent — waiting for your Mac to check in")
+            } else if isOffline {
+                Image(systemName: "wifi.exclamationmark")
+                    .foregroundStyle(.red)
+                Text("Mac unreachable — commands will apply on reconnect")
             } else {
                 Image(systemName: statusSymbol)
                     .foregroundStyle(awakeActive ? .green : .secondary)
@@ -195,13 +200,18 @@ struct MacControlView: View {
     @State private var waitingCommandId: String?
     @State private var waitTimeout: Task<Void, Never>?
 
+    /// Matches the .offline threshold in MacReachabilityBanner (10 minutes).
+    private let offlineThreshold: TimeInterval = 600
+
     var body: some View {
         Group {
             if let mac = macStore.primary {
+                let offline = Date().timeIntervalSince(mac.lastSeen) >= offlineThreshold
                 MacControlCard(
                     macName: mac.name,
                     lastSeen: mac.lastSeen,
                     isDemo: false,
+                    isOffline: offline,
                     mode: mode,
                     screen: screen,
                     timerHours: timerHours,

DoomCoderCompanion/DoomCoderCompanion/UI/MacReachabilityBanner.swift

@@ -103,7 +103,16 @@ struct MacReachabilityBanner: View {
 
     private func refresh() async {
         isRefreshing = true
-        await engine.fetchChanges()
+        // When the Mac is in .offline state, the stale heartbeat was already seen
+        // by the sync engine. An incremental fetchChanges() won't return it. Use
+        // forceFetchAll() to wipe the token and do a fresh full fetch so that the
+        // Mac's latest record is retrieved even if it hasn't changed since our last
+        // sync. For .stale (3-10 min), incremental fetch is sufficient.
+        if let mac = macStore.primary, staleness(for: mac) == .offline {
+            await engine.forceFetchAll()
+        } else {
+            await engine.fetchChanges()
+        }
         now = Date()
         isRefreshing = false
     }

DoomCoderCompanion/DoomCoderCompanion/UI/SettingsView.swift

@@ -142,7 +142,7 @@ struct SettingsView: View {
             LabeledContent("Build") {
                 Text(Bundle.main.infoDictionary?["CFBundleVersion"] as? String ?? "—")
             }
-            LabeledContent("Last sync") {
+            LabeledContent("iCloud sync") {
                 if let ts = sync.lastSyncAt {
                     Text(ts, style: .relative).foregroundStyle(.secondary)
                 } else {