Show all Kitten TTS 2 voices again (the API now lists built-in voices as type public)

Since about 25 Oct the KittenML API lists Kitten TTS 2's built-in voices with type "public" instead of "built_in". The demo only accepted "built_in", so its voice list came back empty and it fell back to eight hard-coded voices. It now accepts both, so all 173 voices in twenty languages show again; cloned ("custom") voices are still never offered. The four voices platform.kittenml.com stopped hiding on 22 Oct are shown too.

Tested locally: Kitten TTS 2 and 0.8 Mini generate, 173 voices listed. No new secret or setting needed.

app.py

@@ -39,8 +39,9 @@ VOICES_08 = [("Bella · Warm", "Bella"), ("Jasper · Narrator", "Jasper"), ("Lun
              ("Rosie · Bright", "Rosie"), ("Hugo · Assistant", "Hugo"), ("Kiki · Playful", "Kiki"), ("Leo · Bold", "Leo")]
 DEFAULT_VOICE_08 = "Jasper"
 
-# Kitten TTS 2 voices come from the API. Listed there but not offered on platform.kittenml.com:
-HIDDEN_VOICES = {"frank_gravelly_male_18", "diana_stern_female_20", "miles_gentle_male_25", "english_40"}
+# Kitten TTS 2 voices come from the API. The built-in voices are listed with type "public" (since late October
+# 2026; "built_in" before). "custom" voices are the key's own clones and are never offered or accepted.
+OFFERED_VOICE_TYPES = {"public", "built_in"}
 DEFAULT_VOICE_TTS2 = "saoirse_joyful_irish_female_07"
 LANGUAGE_NAMES = {
     "en": "English", "hi": "Hindi", "es": "Spanish", "fr": "French", "de": "German", "it": "Italian",
@@ -146,7 +147,7 @@ def _clean_name(name):
 def tts2_voices(max_age=3600):
     """Every built-in Kitten TTS 2 voice the API lists, refreshed hourly.
 
-    Only built-in voices: the key's own cloned voices must never be offered or accepted.
+    Only the built-in voices: the key's own cloned voices must never be offered or accepted.
     """
     with _voices_lock:
         if API_KEY and time.time() - _voices["at"] > max_age:
@@ -157,7 +158,7 @@ def tts2_voices(max_age=3600):
                     {"id": v["id"], "name": _clean_name(v.get("name") or v["id"]), "language": v.get("language") or "en",
                      "preview": bool(v.get("experimental"))}
                     for v in response.json().get("data", [])
-                    if v.get("type") == "built_in" and v.get("id") and v["id"] not in HIDDEN_VOICES
+                    if v.get("type") in OFFERED_VOICE_TYPES and v.get("id")
                 ]
                 if listed:
                     _voices["list"] = listed