rewrite bot in TypeScript and add locale switching

tests/secure-files.test.ts

@@ -0,0 +1,14 @@
+import { describe, expect, test } from "bun:test";
+import { mkdtempSync, rmSync } from "node:fs";
+import { join } from "node:path";
+import { withExclusiveFileLock } from "../src/storage/secure-files.js";
+
+describe("file locks", () => {
+  test("releases the lock directory after the action", async () => {
+    const directory = mkdtempSync(join(process.env.TMPDIR ?? "/tmp", "miband-lock-"));
+    const path = join(directory, "sync.lock");
+    await withExclusiveFileLock(path, async () => "first");
+    await expect(withExclusiveFileLock(path, async () => "second")).resolves.toBe("second");
+    rmSync(directory, { recursive: true, force: true });
+  });
+});