Settings Feature Enhancement

Nucleic-Session: 89BFAB13-D559-43FC-BE28-0B2639BECF0F
Co-authored-by: Nucleic <[email protected]>

NucleicRemote/NucleicRemote/Models/RemoteStore.swift

@@ -78,6 +78,20 @@ final class RemoteStore: ObservableObject {
     @Published private(set) var openDiff: WireSessionDiff?
     @Published private(set) var diffLoading = false
 
+    /// "Add a device to this mesh" (Settings): the phone asks a connected Mac to mint a join code
+    /// and shows it as a QR / copyable link. The phone can't mint one itself (it runs no listener),
+    /// so this is always relayed through a live, capable host.
+    enum AddDeviceState: Equatable {
+        case idle
+        case requesting          // waiting on the host's `pairingCode` reply
+        case ready(String)       // the `nucleic://pair?d=…` join code to display
+        case unavailable         // no live host could mint one right now
+    }
+    @Published private(set) var addDevice: AddDeviceState = .idle
+    /// The host we asked to mint the current code, so a dismiss can tell the *same* Mac to close
+    /// its pairing window.
+    private var pairingMintHostID: String?
+
     /// A transient host-reported error (the mobile echo of the Mac's last-error bubble):
     /// shown as a red bubble at the bottom of the screen, auto-dismissed after a few seconds.
     struct LastError: Equatable, Identifiable {