Build TercihAI MVP: landing page, YÖK Atlas data pipeline, rank-based results

- Add product vision/market research doc (VISION.md)
- Set up shadcn/ui (radix + nova preset) with blue/orange theme, Outfit + Work Sans fonts
- Landing page: hero with rank input, problem/steps sections, comparison table, FAQ
- Data pipeline: CSV archive ingest (2021-2024) + live YÖK Atlas API refresh (2025)
  into SQLite (npm run ingest / refresh); zeros normalized to NULL
- /sonuc page: hayal/dengeli/garanti buckets by COALESCE(sira2025, sira2024),
  score-type switcher, 2024→2025 trend indicators
- Add ui-ux-pro-max and shadcn agent skills, shadcn MCP config, launch.json

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/components/hero-form.tsx

@@ -0,0 +1,50 @@
+"use client";
+
+import { useState } from "react";
+import { useRouter } from "next/navigation";
+import { ArrowRight } from "lucide-react";
+import { toast } from "sonner";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+
+export function HeroForm() {
+  const [siralama, setSiralama] = useState("");
+  const router = useRouter();
+
+  function handleSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    const value = Number(siralama.replace(/\./g, ""));
+    if (!value || value < 1 || value > 4_000_000) {
+      toast.error("Geçerli bir başarı sıralaması gir (ör. 85.000).");
+      return;
+    }
+    router.push(`/sonuc?sira=${value}`);
+  }
+
+  return (
+    <form
+      onSubmit={handleSubmit}
+      className="flex w-full max-w-md flex-col gap-3 sm:flex-row"
+    >
+      <label htmlFor="siralama" className="sr-only">
+        YKS başarı sıralaması
+      </label>
+      <Input
+        id="siralama"
+        inputMode="numeric"
+        placeholder="YKS başarı sıralaman (ör. 85.000)"
+        value={siralama}
+        onChange={(e) => setSiralama(e.target.value)}
+        className="h-12 flex-1 bg-white text-base"
+      />
+      <Button
+        type="submit"
+        size="lg"
+        className="h-12 cursor-pointer bg-orange-500 text-white transition-colors duration-200 hover:bg-orange-600"
+      >
+        Listemi oluştur
+        <ArrowRight className="size-4" aria-hidden />
+      </Button>
+    </form>
+  );
+}