feat(ios): add Talk voice directive hint toggle (#18250)

* feat(ios): add Talk voice directive hint toggle

* docs(changelog): credit voice directive hint slice

---------

Co-authored-by: Mariano Belinky <mariano@mb-server-643.local>

apps/ios/Sources/Settings/SettingsTab.swift

@@ -15,6 +15,7 @@ struct SettingsTab: View {
     @AppStorage("voiceWake.enabled") private var voiceWakeEnabled: Bool = false
     @AppStorage("talk.enabled") private var talkEnabled: Bool = false
     @AppStorage("talk.button.enabled") private var talkButtonEnabled: Bool = true
+    @AppStorage("talk.voiceDirectiveHint.enabled") private var talkVoiceDirectiveHintEnabled: Bool = true
     @AppStorage("camera.enabled") private var cameraEnabled: Bool = true
     @AppStorage("location.enabledMode") private var locationEnabledModeRaw: String = OpenClawLocationMode.off.rawValue
     @AppStorage("location.preciseEnabled") private var locationPreciseEnabled: Bool = true
@@ -255,6 +256,10 @@ struct SettingsTab: View {
                         Text("Use this local override when gateway config redacts talk.apiKey for mobile clients.")
                             .font(.footnote)
                             .foregroundStyle(.secondary)
+                        Toggle("Voice Directive Hint", isOn: self.$talkVoiceDirectiveHintEnabled)
+                        Text("Include ElevenLabs voice switching instructions in the Talk Mode prompt. Disable to save tokens.")
+                            .font(.footnote)
+                            .foregroundStyle(.secondary)
                         // Keep this separate so users can hide the side bubble without disabling Talk Mode.
                         Toggle("Show Talk Button", isOn: self.$talkButtonEnabled)
 

apps/ios/Sources/Voice/TalkModeManager.swift

@@ -828,7 +828,11 @@ final class TalkModeManager: NSObject {
     private func buildPrompt(transcript: String) -> String {
         let interrupted = self.lastInterruptedAtSeconds
         self.lastInterruptedAtSeconds = nil
-        return TalkPromptBuilder.build(transcript: transcript, interruptedAtSeconds: interrupted)
+        let includeVoiceDirectiveHint = (UserDefaults.standard.object(forKey: "talk.voiceDirectiveHint.enabled") as? Bool) ?? true
+        return TalkPromptBuilder.build(
+            transcript: transcript,
+            interruptedAtSeconds: interrupted,
+            includeVoiceDirectiveHint: includeVoiceDirectiveHint)
     }
 
     private enum ChatCompletionState: CustomStringConvertible {