init: media-center v2

Rewrite of ESH-Media v1 with separated main/renderer/shared architecture
(vite-plugin-electron, React 18, react-router-dom). Includes NeDB storage,
electron-store config, proxy manager with FoxyProxy/uBlock extensions,
custom server-checked updater, NSIS installer.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/renderer/components/UpdateNotification.tsx

@@ -0,0 +1,60 @@
+import React, { useState } from 'react';
+import { VersionInfo } from '../../shared/types';
+import '../styles/UpdateNotification.css';
+
+interface UpdateNotificationProps {
+  versionInfo: VersionInfo;
+  onClose: () => void;
+}
+
+const UpdateNotification: React.FC<UpdateNotificationProps> = ({
+  versionInfo,
+  onClose,
+}) => {
+  const [isDownloading, setIsDownloading] = useState(false);
+
+  const handleUpdate = async () => {
+    setIsDownloading(true);
+
+    try {
+      const installerPath = await window.electronAPI.downloadUpdate(
+        versionInfo.downloadUrl
+      );
+      alert(`Обновление загружено: ${installerPath}\nПриложение будет закрыто для установки.`);
+      // App will close automatically after opening installer
+    } catch (error) {
+      console.error('Error downloading update:', error);
+      alert('Ошибка при загрузке обновления');
+      setIsDownloading(false);
+    }
+  };
+
+  return (
+    <div className="update-notification">
+      <div className="update-content">
+        <h3>Доступно обновление!</h3>
+        <p className="version">
+          Версия <strong>{versionInfo.latestVersion}</strong>
+        </p>
+        <div className="changelog">
+          <h4>Что нового:</h4>
+          <pre>{versionInfo.changelog}</pre>
+        </div>
+        <div className="update-actions">
+          <button
+            className="button-primary"
+            onClick={handleUpdate}
+            disabled={isDownloading}
+          >
+            {isDownloading ? 'Загрузка...' : 'Обновить сейчас'}
+          </button>
+          <button className="button-secondary" onClick={onClose}>
+            Напомнить позже
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default UpdateNotification;