Enroll modal: days input instead of date; hide bundle if base course owned

- Quick-enroll modal now takes access duration in days (0/empty = unlimited)
  and shows the computed expiry date, instead of a manual date picker.
- Dashboard upsell no longer shows the "Всё включено" bundle of a course
  the student already owns in its base edition (obsidian/zotero).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/(student)/dashboard/page.tsx

@@ -57,11 +57,20 @@ export default async function StudentDashboard() {
 
   // Витрина: продаваемые курсы, которых у студента нет → заблюренные карточки
   const enrolledSlugs = new Set(enrollments.map((e) => e.course.slug));
+  // Не показываем «Всё включено», если у студента уже есть обычная версия того же курса
+  const SUPPRESS_IF_OWNED: Record<string, string> = {
+    "obsidian-full": "obsidian", // ВВ Obsidian 2025 ← обычный Obsidian 2025
+    "zotero-full": "zotero", // ВВ Zotero ← обычный Zotero
+  };
   const storeCourses = await prisma.course.findMany({
     where: { slug: { in: Object.keys(STORE_LINKS) }, published: true },
     select: { id: true, slug: true, title: true, description: true, coverImage: true },
   });
-  const locked = storeCourses.filter((c) => !enrolledSlugs.has(c.slug));
+  const locked = storeCourses.filter(
+    (c) =>
+      !enrolledSlugs.has(c.slug) &&
+      !(SUPPRESS_IF_OWNED[c.slug] && enrolledSlugs.has(SUPPRESS_IF_OWNED[c.slug]))
+  );
 
   return (
     <main className="max-w-5xl mx-auto px-6 py-10 w-full">