Add student profile page with password change

- New page /profile: shows name/email and password change form
- Uses authClient.changePassword (current + new + confirm)
- Student name in header is now a link to /profile

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -0,0 +1,42 @@
+import { headers } from "next/headers";
+import { auth } from "@/lib/auth";
+import { redirect } from "next/navigation";
+import { ChangePasswordForm } from "./change-password-form";
+
+export const metadata = { title: "Профиль" };
+
+export default async function ProfilePage() {
+  const session = await auth.api.getSession({ headers: await headers() });
+  if (!session) redirect("/login");
+
+  return (
+    <main className="max-w-lg mx-auto px-4 py-10 w-full">
+      <h1 className="text-xl font-bold tracking-wide mb-8" style={{ color: "var(--foreground)" }}>
+        Профиль
+      </h1>
+
+      <div className="card-aubade p-6 mb-6">
+        <h2 className="text-xs uppercase tracking-widest font-bold mb-4" style={{ color: "var(--muted-foreground)" }}>
+          Аккаунт
+        </h2>
+        <div className="space-y-3 text-sm" style={{ color: "var(--foreground)" }}>
+          <div className="flex justify-between">
+            <span style={{ color: "var(--muted-foreground)" }}>Имя</span>
+            <span>{session.user.name}</span>
+          </div>
+          <div className="flex justify-between">
+            <span style={{ color: "var(--muted-foreground)" }}>Email</span>
+            <span>{session.user.email}</span>
+          </div>
+        </div>
+      </div>
+
+      <div className="card-aubade p-6">
+        <h2 className="text-xs uppercase tracking-widest font-bold mb-4" style={{ color: "var(--muted-foreground)" }}>
+          Смена пароля
+        </h2>
+        <ChangePasswordForm />
+      </div>
+    </main>
+  );
+}