feat(api, ui): add Prisma client import and type definition for custom links

src/app/api/user/profile/route.ts

@@ -1,5 +1,6 @@
 import { NextRequest, NextResponse } from "next/server";
 import { z } from "zod";
+import { Prisma } from "@prisma/client";
 import { auth } from "@/lib/auth";
 import { db } from "@/lib/db";
 
@@ -66,7 +67,7 @@ export async function PATCH(request: NextRequest) {
         username,
         avatar: avatar || null,
         bio: bio || null,
-        customLinks: customLinks && customLinks.length > 0 ? customLinks : null,
+        customLinks: customLinks && customLinks.length > 0 ? customLinks : Prisma.DbNull,
       },
       select: {
         id: true,

src/app/settings/page.tsx

@@ -5,6 +5,7 @@ import { db } from "@/lib/db";
 import config from "@/../prompts.config";
 import { ProfileForm } from "@/components/settings/profile-form";
 import { ApiKeySettings } from "@/components/settings/api-key-settings";
+import type { CustomLink } from "@/components/user/profile-links";
 
 export default async function SettingsPage() {
   const session = await auth();
@@ -44,7 +45,13 @@ export default async function SettingsPage() {
       </div>
 
       <div className="space-y-6">
-        <ProfileForm user={user} showVerifiedSection={!config.homepage?.useCloneBranding} />
+        <ProfileForm 
+          user={{
+            ...user,
+            customLinks: user.customLinks as CustomLink[] | null,
+          }} 
+          showVerifiedSection={!config.homepage?.useCloneBranding} 
+        />
 
         {config.features.mcp !== false && (
           <ApiKeySettings