Implement calendar module

src/lib/auth.ts

@@ -10,6 +10,7 @@ import {
   verificationTokens,
 } from "@/modules/_core/schema";
 import { eq } from "drizzle-orm";
+import { ensureDefaultCalendarsForMembership } from "@/modules/calendar/server/defaults";
 
 declare module "next-auth" {
   interface Session {
@@ -59,6 +60,10 @@ export const { handlers, auth, signIn, signOut } = NextAuth({
             .insert(householdMembers)
             .values({ householdId: household.id, userId: user.id, role })
             .onConflictDoNothing();
+          await ensureDefaultCalendarsForMembership({
+            householdId: household.id,
+            userId: user.id,
+          });
         }
       }
       return true;