add loading and optimize query using cache and pwa

app/(public)/trips/loading.tsx

@@ -0,0 +1,29 @@
+/** Skeleton daftar trip — tampil instan saat list masih di-fetch. */
+export default function Loading() {
+  return (
+    <div className="mx-auto max-w-6xl px-4 py-6 sm:py-8">
+      <div className="mb-6 h-8 w-56 animate-pulse rounded-lg bg-neutral-200 sm:mb-8" />
+      <div className="mb-6 h-40 animate-pulse rounded-2xl bg-neutral-100" />
+
+      <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
+        {Array.from({ length: 6 }).map((_, i) => (
+          <div
+            key={i}
+            className="overflow-hidden rounded-2xl border border-neutral-200 bg-white"
+          >
+            <div className="h-40 animate-pulse bg-neutral-200" />
+            <div className="space-y-3 p-4">
+              <div className="h-5 w-3/4 animate-pulse rounded bg-neutral-200" />
+              <div className="h-4 w-1/2 animate-pulse rounded bg-neutral-100" />
+              <div className="h-4 w-2/3 animate-pulse rounded bg-neutral-100" />
+              <div className="mt-3 flex items-center justify-between border-t border-neutral-100 pt-3">
+                <div className="h-5 w-20 animate-pulse rounded bg-neutral-200" />
+                <div className="h-4 w-16 animate-pulse rounded bg-neutral-100" />
+              </div>
+            </div>
+          </div>
+        ))}
+      </div>
+    </div>
+  );
+}