Add voice history, default preset voice, and one-click tab

Keep synthesized wav files browsable with playback and download, default to preset steady male voice, show one-click pipeline as the first tab, and reduce post-synthesis UI flicker.

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

voice_presets.py

@@ -22,6 +22,8 @@ PRESETS_DIR = VOICES_DIR / "presets"
 MANIFEST_PATH = VOICES_DIR / "manifest.json"
 
 CUSTOM_VOICE_ID = "custom"
+DEFAULT_PRESET_VOICE_ID = "preset_01"
+DEFAULT_PRESET_VOICE_LABEL = "预设·沉稳男声"
 
 # 生成脚本写入的预设元数据（.pt 文件不入 Git）
 DEFAULT_MANIFEST = {
@@ -85,13 +87,24 @@ def list_voice_choices() -> List[Tuple[str, str]]:
 def default_voice_id() -> str:
     choices = list_voice_choices()
     if not choices:
-        return CUSTOM_VOICE_ID
+        return DEFAULT_PRESET_VOICE_ID
     for _label, vid in choices:
-        if vid == CUSTOM_VOICE_ID:
-            return CUSTOM_VOICE_ID
+        if vid == DEFAULT_PRESET_VOICE_ID:
+            return vid
+    for _label, vid in choices:
+        if vid != CUSTOM_VOICE_ID:
+            return vid
     return choices[0][1]
 
 
+def default_voice_label() -> str:
+    for lbl, vid in list_voice_choices():
+        if vid == DEFAULT_PRESET_VOICE_ID:
+            return lbl
+    labels = voice_choice_labels()
+    return labels[0] if labels else DEFAULT_PRESET_VOICE_LABEL
+
+
 def voice_choice_labels() -> List[str]:
     return [c[0] for c in list_voice_choices()]