Migrate app to Node Electron with modern React UI

src/main/logger.ts

@@ -0,0 +1,28 @@
+import fs from "node:fs";
+import path from "node:path";
+
+let logFilePath = path.resolve(process.cwd(), "rd_downloader.log");
+
+export function configureLogger(baseDir: string): void {
+  logFilePath = path.join(baseDir, "rd_downloader.log");
+}
+
+function write(level: "INFO" | "WARN" | "ERROR", message: string): void {
+  const line = `${new Date().toISOString()} [${level}] ${message}\n`;
+  try {
+    fs.mkdirSync(path.dirname(logFilePath), { recursive: true });
+    fs.appendFileSync(logFilePath, line, "utf8");
+  } catch {
+    // ignore logging failures
+  }
+}
+
+export const logger = {
+  info: (msg: string): void => write("INFO", msg),
+  warn: (msg: string): void => write("WARN", msg),
+  error: (msg: string): void => write("ERROR", msg)
+};
+
+export function getLogFilePath(): string {
+  return logFilePath;
+}