feat(ui): add centered talk orb

apps/ios/Sources/Model/NodeAppModel.swift

@@ -290,7 +290,7 @@ final class NodeAppModel {
         Self.color(fromHex: self.seamColorHex) ?? Self.defaultSeamColor
     }
 
-    private static let defaultSeamColor = Color(red: 0.62, green: 0.88, blue: 1.0)
+    private static let defaultSeamColor = Color(red: 127 / 255.0, green: 184 / 255.0, blue: 212 / 255.0)
 
     private static func color(fromHex raw: String?) -> Color? {
         let trimmed = (raw ?? "").trimmingCharacters(in: .whitespacesAndNewlines)

apps/ios/Sources/RootCanvas.swift

@@ -166,6 +166,12 @@ private struct CanvasContent: View {
             .padding(.top, 10)
             .padding(.trailing, 10)
         }
+        .overlay(alignment: .center) {
+            if self.appModel.talkMode.isEnabled {
+                TalkOrbOverlay()
+                    .transition(.opacity)
+            }
+        }
         .overlay(alignment: .topLeading) {
             StatusPill(
                 bridge: self.bridgeStatus,

apps/ios/Sources/Voice/TalkOrbOverlay.swift

@@ -0,0 +1,74 @@
+import SwiftUI
+
+struct TalkOrbOverlay: View {
+    @Environment(NodeAppModel.self) private var appModel
+    @State private var pulse: Bool = false
+
+    var body: some View {
+        let seam = self.appModel.seamColor
+        let status = self.appModel.talkMode.statusText.trimmingCharacters(in: .whitespacesAndNewlines)
+
+        VStack(spacing: 14) {
+            ZStack {
+                Circle()
+                    .stroke(seam.opacity(0.26), lineWidth: 2)
+                    .frame(width: 220, height: 220)
+                    .scaleEffect(self.pulse ? 1.15 : 0.96)
+                    .opacity(self.pulse ? 0.0 : 1.0)
+                    .animation(.easeOut(duration: 1.3).repeatForever(autoreverses: false), value: self.pulse)
+
+                Circle()
+                    .stroke(seam.opacity(0.18), lineWidth: 2)
+                    .frame(width: 220, height: 220)
+                    .scaleEffect(self.pulse ? 1.45 : 1.02)
+                    .opacity(self.pulse ? 0.0 : 0.9)
+                    .animation(.easeOut(duration: 1.9).repeatForever(autoreverses: false).delay(0.2), value: self.pulse)
+
+                Circle()
+                    .fill(
+                        RadialGradient(
+                            colors: [
+                                seam.opacity(0.95),
+                                seam.opacity(0.40),
+                                Color.black.opacity(0.55),
+                            ],
+                            center: .center,
+                            startRadius: 1,
+                            endRadius: 92))
+                    .frame(width: 136, height: 136)
+                    .overlay(
+                        Circle()
+                            .stroke(seam.opacity(0.35), lineWidth: 1)
+                    )
+                    .shadow(color: seam.opacity(0.32), radius: 26, x: 0, y: 0)
+                    .shadow(color: Color.black.opacity(0.50), radius: 22, x: 0, y: 10)
+            }
+            .contentShape(Circle())
+            .onTapGesture {
+                self.appModel.talkMode.userTappedOrb()
+            }
+
+            if !status.isEmpty, status != "Off" {
+                Text(status)
+                    .font(.system(.footnote, design: .rounded).weight(.semibold))
+                    .foregroundStyle(Color.white.opacity(0.92))
+                    .padding(.horizontal, 12)
+                    .padding(.vertical, 8)
+                    .background(
+                        Capsule()
+                            .fill(Color.black.opacity(0.40))
+                            .overlay(
+                                Capsule().stroke(seam.opacity(0.22), lineWidth: 1)
+                            )
+                    )
+            }
+        }
+        .padding(28)
+        .onAppear {
+            self.pulse = true
+        }
+        .accessibilityElement(children: .combine)
+        .accessibilityLabel("Talk Mode \(status)")
+    }
+}
+