feat(ios): reconnect to last bridge

apps/ios/Sources/RootTabs.swift

@@ -1,6 +1,8 @@
 import SwiftUI
 
 struct RootTabs: View {
+    @EnvironmentObject private var appModel: NodeAppModel
+
     var body: some View {
         TabView {
             ScreenTab()
@@ -10,7 +12,71 @@ struct RootTabs: View {
                 .tabItem { Label("Voice", systemImage: "mic") }
 
             SettingsTab()
-                .tabItem { Label("Settings", systemImage: "gearshape") }
+                .tabItem {
+                    VStack {
+                        ZStack(alignment: .topTrailing) {
+                            Image(systemName: "gearshape")
+                            Circle()
+                                .fill(self.settingsIndicatorColor)
+                                .frame(width: 9, height: 9)
+                                .overlay(
+                                    Circle()
+                                        .stroke(.black.opacity(0.2), lineWidth: 0.5))
+                                .shadow(
+                                    color: self.settingsIndicatorGlowColor,
+                                    radius: self.settingsIndicatorGlowRadius,
+                                    x: 0,
+                                    y: 0)
+                                .offset(x: 7, y: -2)
+                        }
+                        Text("Settings")
+                    }
+                }
+        }
+    }
+
+    private enum BridgeIndicatorState {
+        case connected
+        case connecting
+        case disconnected
+    }
+
+    private var bridgeIndicatorState: BridgeIndicatorState {
+        if self.appModel.bridgeServerName != nil { return .connected }
+        if self.appModel.bridgeStatusText.localizedCaseInsensitiveContains("connecting") { return .connecting }
+        return .disconnected
+    }
+
+    private var settingsIndicatorColor: Color {
+        switch self.bridgeIndicatorState {
+        case .connected:
+            Color.green
+        case .connecting:
+            Color.yellow
+        case .disconnected:
+            Color.red
+        }
+    }
+
+    private var settingsIndicatorGlowColor: Color {
+        switch self.bridgeIndicatorState {
+        case .connected:
+            Color.green.opacity(0.75)
+        case .connecting:
+            Color.yellow.opacity(0.6)
+        case .disconnected:
+            Color.clear
+        }
+    }
+
+    private var settingsIndicatorGlowRadius: CGFloat {
+        switch self.bridgeIndicatorState {
+        case .connected:
+            6
+        case .connecting:
+            4
+        case .disconnected:
+            0
         }
     }
 }