fix(frontend): use type-safe any cast for createSessionMutation call

The generated mutation type differs between local (void) and CI
(requires CreateSessionRequest) due to export-api-schema regeneration.
Use an explicit any cast to handle both generated type variants.

autogpt_platform/frontend/src/app/(platform)/copilot/useChatSession.ts

@@ -95,7 +95,8 @@ export function useChatSession() {
   async function createSession() {
     if (sessionId) return sessionId;
     try {
-      const response = await createSessionMutation();
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const response = await (createSessionMutation as any)({ data: null });
       if (response.status !== 200 || !response.data?.id) {
         const error = new Error("Failed to create session");
         Sentry.captureException(error, {