feat: add voice capability status reporting to client

packages/app/src/contexts/voice-context.tsx

@@ -2,6 +2,7 @@ import { createContext, useContext, useState, ReactNode, useCallback, useEffect,
 import { useSpeechmaticsAudio } from "@/hooks/use-speechmatics-audio";
 import type { SessionState } from "@/stores/session-store";
 import { useSessionStore } from "@/stores/session-store";
+import { resolveVoiceUnavailableMessage } from "@/utils/server-info-capabilities";
 import { activateKeepAwakeAsync, deactivateKeepAwake } from "expo-keep-awake";
 import { REALTIME_VOICE_VAD_CONFIG } from "@/voice/realtime-voice-config";
 
@@ -334,6 +335,13 @@ export function VoiceProvider({ children }: VoiceProviderProps) {
       if (!session) {
         throw new Error(`Host ${serverId} is not connected`);
       }
+      const unavailableMessage = resolveVoiceUnavailableMessage({
+        serverInfo: session.serverInfo,
+        mode: "voice",
+      });
+      if (unavailableMessage) {
+        throw new Error(unavailableMessage);
+      }
 
       setIsVoiceSwitching(true);
       voiceTransportReadyRef.current = false;