feat: add model field to setup form; use it for validation ping and as default in conversation setup

custom_components/anthropic_custom/config_flow.py

@@ -78,6 +78,7 @@ STEP_USER_DATA_SCHEMA = vol.Schema(
     {
         vol.Required(CONF_API_KEY): str,
         vol.Optional(CONF_BASE_URL): str,
+        vol.Optional(CONF_CHAT_MODEL, default="claude-3-haiku-20240307"): str,
     }
 )
 
@@ -110,7 +111,7 @@ async def validate_input(hass: HomeAssistant, data: dict[str, Any]) -> None:
         if exc.status_code == 404:
             # Proxy does not support models endpoint — validate via a tiny messages call
             await client.messages.create(
-                model="claude-3-haiku-20240307",
+                model=data.get(CONF_CHAT_MODEL) or "claude-3-haiku-20240307",
                 max_tokens=1,
                 messages=[{"role": "user", "content": "hi"}],
                 timeout=10.0,
@@ -373,10 +374,12 @@ class ConversationSubentryFlowHandler(ConfigSubentryFlow):
         """Manage advanced options."""
         errors: dict[str, str] = {}
 
+        # Use model stored in parent entry as default (set during setup)
+        entry_default_model = self._get_entry().data.get(CONF_CHAT_MODEL, DEFAULT[CONF_CHAT_MODEL])
         step_schema: VolDictType = {
             vol.Optional(
                 CONF_CHAT_MODEL,
-                default=DEFAULT[CONF_CHAT_MODEL],
+                default=entry_default_model,
             ): SelectSelector(
                 SelectSelectorConfig(
                     options=await self._get_model_list(), custom_value=True