Add the VOX prosody preference and panel controls

TODO.md

@@ -58,12 +58,16 @@ Ordered backlog. `CURRENT.md` tracks the live session state.
 10. Mobile web UI: first draft at 390px with the four tabs (Users, Chat, Call, Activity) is
     implemented and rendered headless. Next: move the transcript into the Call tab, put the TTS
     box in the Call tab as in 1c, and verify with real data on a phone-width viewport.
-11. TTS VOX preference: a `tts.vox` toggle that exports `VESKSLOP_TTS_VOX` (like `words`), an
-    optional `VOX_CLEAN`, and a help line in the TTS panel. Requested in `TTS-DESIGN.md`; the
-    wrapper side is ready and verified. Inline `/rate` and `/pitch` need no UI.
 
 ## Media archive follow-ups
 
+## TTS follow-ups
+
+1. **HTTP provider voice discovery.** `TTS-DESIGN.md` specifies `GET /voices` (id, name, language,
+   gender, speed/pitch ranges) for the HTTP provider; Veskslop still lists voices from espeak or
+   `VESKSLOP_TTS_VOICES` only. The command-provider path in use does not need it; implement when an
+   HTTP engine with multiple voices is deployed.
+
 ## Web UI follow-ups
 
 Ordered after the voice backend unless the owner asks first.