Add "login as user" to user profile card

Extract ImpersonateButton into a shared component and reuse it on the
admin user profile page (header, hidden for admins) — same behaviour as
the users list.

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

src/components/admin/impersonate-button.tsx

@@ -0,0 +1,46 @@
+"use client";
+
+import { useState } from "react";
+
+export function ImpersonateButton({
+  userId,
+  className,
+}: {
+  userId: string;
+  className?: string;
+}) {
+  const [loading, setLoading] = useState(false);
+
+  async function handleImpersonate() {
+    setLoading(true);
+    try {
+      const res = await fetch("/api/auth/admin/impersonate-user", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ userId }),
+        credentials: "include",
+      });
+      if (!res.ok) throw new Error(await res.text());
+      window.location.href = "/dashboard";
+    } catch (e) {
+      console.error("Impersonation failed:", e);
+      setLoading(false);
+    }
+  }
+
+  return (
+    <button
+      type="button"
+      onClick={handleImpersonate}
+      disabled={loading}
+      className={`text-xs px-2 py-1 transition-colors ${className ?? ""}`}
+      style={{
+        border: "1px solid var(--border)",
+        color: loading ? "var(--muted-foreground)" : "var(--foreground)",
+        background: "transparent",
+      }}
+    >
+      {loading ? "..." : "Войти как"}
+    </button>
+  );
+}

src/components/admin/users-table.tsx

@@ -4,6 +4,7 @@ import { useState } from "react";
 import Link from "next/link";
 import { Badge } from "@/components/ui/badge";
 import { QuickEnrollButton } from "@/components/admin/quick-enroll-modal";
+import { ImpersonateButton } from "@/components/admin/impersonate-button";
 
 type Enrollment = {
   courseId: string;
@@ -91,43 +92,6 @@ function UserPopup({ user }: { user: UserRow }) {
   );
 }
 
-function ImpersonateButton({ userId }: { userId: string }) {
-  const [loading, setLoading] = useState(false);
-
-  async function handleImpersonate() {
-    setLoading(true);
-    try {
-      const res = await fetch("/api/auth/admin/impersonate-user", {
-        method: "POST",
-        headers: { "Content-Type": "application/json" },
-        body: JSON.stringify({ userId }),
-        credentials: "include",
-      });
-      if (!res.ok) throw new Error(await res.text());
-      window.location.href = "/dashboard";
-    } catch (e) {
-      console.error("Impersonation failed:", e);
-      setLoading(false);
-    }
-  }
-
-  return (
-    <button
-      type="button"
-      onClick={handleImpersonate}
-      disabled={loading}
-      className="text-xs px-2 py-1 transition-colors"
-      style={{
-        border: "1px solid var(--border)",
-        color: loading ? "var(--muted-foreground)" : "var(--foreground)",
-        background: "transparent",
-      }}
-    >
-      {loading ? "..." : "Войти как"}
-    </button>
-  );
-}
-
 export function UsersTable({ users }: { users: UserRow[] }) {
   const [hoveredId, setHoveredId] = useState<string | null>(null);