Add default voice setting and apply to chat

src/lib/stores/index.ts

@@ -12,6 +12,7 @@ export const chatId = writable('');
 export const chats = writable([]);
 export const tags = writable([]);
 export const models = writable([]);
+export const voices = writable([]);
 
 export const modelfiles = writable([]);
 export const prompts = writable([]);