fix types and linting

app/api/stripe/checkout/route.ts

@@ -15,7 +15,7 @@ export async function POST() {
     }
 
     const stripe = getStripeClient();
-    const supabase = createSupabaseRouteClient();
+    const supabase = createSupabaseRouteClient() as any;
 
     const { data: billing, error: billingError } = await supabase
       .from("billing_accounts")
@@ -42,7 +42,10 @@ export async function POST() {
       };
 
       if (billing?.id) {
-        await supabase.from("billing_accounts").update(upsertPayload).eq("id", billing.id);
+        await supabase
+          .from("billing_accounts")
+          .update(upsertPayload)
+          .eq("id", billing.id);
       } else {
         await supabase.from("billing_accounts").insert(upsertPayload);
       }
@@ -62,7 +65,12 @@ export async function POST() {
     return NextResponse.json({ url: session.url });
   } catch (error) {
     return NextResponse.json(
-      { error: error instanceof Error ? error.message : "Failed to create checkout session" },
+      {
+        error:
+          error instanceof Error
+            ? error.message
+            : "Failed to create checkout session",
+      },
       { status: 400 },
     );
   }