feat(social): follows, favorites, comments, reactions, collections, public profiles

Follow/unfollow users. Recipe favorites. Threaded comments with emoji reactions.
Collections (public/private) with shared member invite. Activity feed.
Public profile pages at /u/[username].

apps/web/app/(app)/collections/page.tsx

@@ -0,0 +1,30 @@
+import type { Metadata } from "next";
+import { headers } from "next/headers";
+import { auth } from "@/lib/auth/server";
+import { db, collections, eq, desc } from "@epicure/db";
+import { CollectionsPageContent } from "@/components/collections/collections-page-content";
+
+export const metadata: Metadata = { title: "Collections" };
+
+export default async function CollectionsPage() {
+  const session = await auth.api.getSession({ headers: await headers() });
+  if (!session) return null;
+
+  const userCollections = await db.query.collections.findMany({
+    where: eq(collections.userId, session.user.id),
+    orderBy: desc(collections.updatedAt),
+    with: { recipes: { limit: 1 } },
+  });
+
+  return (
+    <CollectionsPageContent
+      collections={userCollections.map((col) => ({
+        id: col.id,
+        name: col.name,
+        description: col.description,
+        isPublic: col.isPublic,
+        recipeCount: col.recipes.length,
+      }))}
+    />
+  );
+}