Add UI to configure Spotify Client ID in Settings

- Add expandable Configuration section in Spotify settings
- Store Client ID in UserDefaults
- Show Connect button only when Client ID is configured
- Add helper text pointing to Spotify Developer Dashboard

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

IrisCompanion/iris/Views/SettingsView.swift

@@ -12,6 +12,8 @@ import SwiftUI
 struct SettingsView: View {
     @EnvironmentObject private var orchestrator: ContextOrchestrator
     @EnvironmentObject private var spotifyAuth: SpotifyAuthManager
+    @State private var isConfigExpanded: Bool = false
+    @State private var clientIdInput: String = ""
 
     var body: some View {
         NavigationStack {
@@ -40,6 +42,26 @@ struct SettingsView: View {
                 }
 
                 Section {
+                    DisclosureGroup("Configuration", isExpanded: $isConfigExpanded) {
+                        TextField("Client ID", text: $clientIdInput)
+                            .textInputAutocapitalization(.never)
+                            .autocorrectionDisabled()
+                            .font(.system(.body, design: .monospaced))
+
+                        Text("Get your Client ID from developer.spotify.com/dashboard")
+                            .font(.caption)
+                            .foregroundStyle(.secondary)
+
+                        Button("Save") {
+                            spotifyAuth.setClientId(clientIdInput)
+                            isConfigExpanded = false
+                        }
+                        .disabled(clientIdInput.trimmingCharacters(in: .whitespaces).isEmpty)
+                    }
+                    .onAppear {
+                        clientIdInput = spotifyAuth.clientId
+                    }
+
                     if spotifyAuth.isConnected {
                         HStack {
                             Label("Connected", systemImage: "checkmark.circle.fill")
@@ -52,7 +74,7 @@ struct SettingsView: View {
                                 orchestrator.musicSource = .appleMusic
                             }
                         }
-                    } else {
+                    } else if spotifyAuth.isConfigured {
                         Button {
                             spotifyAuth.startAuth()
                         } label: {
@@ -65,6 +87,10 @@ struct SettingsView: View {
                             }
                         }
                         .disabled(spotifyAuth.isAuthenticating)
+                    } else {
+                        Text("Enter your Client ID above to connect")
+                            .font(.callout)
+                            .foregroundStyle(.secondary)
                     }
 
                     if let error = spotifyAuth.error {
@@ -75,7 +101,7 @@ struct SettingsView: View {
                 } header: {
                     Text("Spotify")
                 } footer: {
-                    if !spotifyAuth.isConnected {
+                    if !spotifyAuth.isConnected && spotifyAuth.isConfigured {
                         Text("Connect your Spotify account to display current track on Glass.")
                     }
                 }