Redesign UI with zen cards, split AI panel, and PWA install support.

Learn uses 64-gua card grid; liuyao/bazi/combined use two input cards plus sticky right AI panel; add manifest, service worker, and install prompt.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/liuyao/page.tsx

@@ -4,9 +4,9 @@ import LiuyaoForm from "@/components/modes/liuyao-form";
 export default function LiuyaoPage() {
   return (
     <PageShell>
-      <div className="px-4 pt-6 text-center">
-        <h1 className="text-xl font-bold">六爻算卦</h1>
-        <p className="mt-1 text-sm text-muted-foreground">
+      <div className="border-b border-border/40 px-4 py-6 text-center">
+        <h1 className="text-2xl font-bold tracking-wide">六爻算卦</h1>
+        <p className="mt-2 text-sm text-muted-foreground">
           问事 · 起卦时空 · 线上 / 线下六爻
         </p>
       </div>