fix: persist user guild map when login token is registered

user_guild_map was only written when a login token was consumed on the
webui login page. Users on stale session cookies never re-login, so
their jobs carried empty guild_id and TTS was posted to whatever global
channel happened to match instead of the server they logged in from.
Persist the guild as soon as the bot registers the token so
_resolve_guild_id() falls back to the correct login guild.

ttstoy/webui/app.py

@@ -1248,6 +1248,17 @@ def api_register_token():
         data.get("guild_id", ""),
         data.get("guild_name", ""),
     )
+    guild_id = data.get("guild_id", "")
+    if guild_id:
+        try:
+            state = _read_json(SHARED_STATE_FILE) if SHARED_STATE_FILE.exists() else {}
+            ugm = state.setdefault("user_guild_map", {})
+            ugm[str(data["user_id"])] = guild_id
+            with open(SHARED_STATE_FILE, "w") as f:
+                json.dump(state, f)
+            log.debug(f"api_register_token: persisted user_guild_map[{data['user_id']}]={guild_id}")
+        except Exception as e:
+            log.warning(f"api_register_token: could not persist user_guild_map: {e}")
     return jsonify({"token": token})