Review Feature Access

Nucleic-Session: 85A6233A-F3F6-44B2-AD0B-261D49EE9C35
Co-authored-by: Nucleic <[email protected]>

NucleicRemote/NucleicRemote/Views/BuildBanner.swift

@@ -131,3 +131,33 @@ struct BuildBanner: View {
         }
     }
 }
+
+/// A slim strip shown while the app is in offline demo mode, so sample data is never mistaken
+/// for a live connection to a Mac. Sits under the `BuildBanner` in `RootView`.
+struct DemoBanner: View {
+    @EnvironmentObject var store: RemoteStore
+
+    var body: some View {
+        if store.demoMode {
+            HStack(spacing: 8) {
+                Image(systemName: "play.circle.fill").font(.system(size: 14, weight: .bold))
+                Text("Demo — sample data, no Mac connected")
+                    .font(.footnote.weight(.semibold))
+                    .lineLimit(1)
+                Spacer(minLength: 8)
+                Text("DEMO")
+                    .font(.caption2.weight(.heavy))
+                    .tracking(0.9)
+                    .padding(.horizontal, 6)
+                    .padding(.vertical, 2)
+                    .background(.white.opacity(0.18), in: .capsule)
+            }
+            .foregroundStyle(.white.opacity(0.95))
+            .padding(.horizontal, 12)
+            .padding(.vertical, 5)
+            .frame(maxWidth: .infinity)
+            .background(Color(red: 0.36, green: 0.36, blue: 0.42))
+            .accessibilityLabel("Demo mode — sample data, not connected to a Mac.")
+        }
+    }
+}