Snapshot Beep + WAV UI before Pomodoro rewrite.

Keep LEDC tones, TF WAV playback, and compact list layout as a tagged baseline.

Co-authored-by: Cursor <cursoragent@cursor.com>

include/audio_test.h

@@ -1,20 +1,29 @@
 #pragma once
 
 #include <Arduino.h>
+#include <stdint.h>
 
 void audio_init();
 
 void audio_set_enabled(bool on);
 bool audio_is_enabled();
 
-// 音量 0–100，默认 20
 void audio_set_volume(uint8_t percent);
 uint8_t audio_get_volume();
 
-void audio_play_music();
+// 内置提示音
+uint8_t sound_count();
+const char *sound_name(uint8_t idx);
+int8_t sound_selected();
+void sound_set_selected(int8_t idx);
+void audio_play_sound(uint8_t idx);
+
+// WAV（TF）
+void audio_play_wav_index(uint8_t idx);
+void audio_play_selected(); // 按当前 tab 语义由 UI 决定；保留播 beep 选中
+
 void audio_stop();
 bool audio_is_playing();
 
 void audio_tick();
-
 const char *audio_last_status();