fix: preserve chatProjectId through the new-chat template reduction

The param-endpoint guard in newConversation reduced a new chat's template to
{ endpoint } only, dropping the chatProjectId injected by the Model Selector /
@ switch — so switching models cleared the project scope. Keep chatProjectId
in the reduced template.

client/src/hooks/useNewConvo.ts

@@ -307,7 +307,7 @@ const useNewConvo = (index = 0) => {
         isParamEndpoint(_preset?.endpoint ?? '', _preset?.endpointType ?? '');
       const template =
         paramEndpoint === true && templateConvoId && templateConvoId === Constants.NEW_CONVO
-          ? { endpoint: _template.endpoint }
+          ? { endpoint: _template.endpoint, chatProjectId: _template.chatProjectId }
           : _template;
 
       const conversation = {