Migrate app to Node Electron with modern React UI

tests/cleanup.test.ts

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+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { afterEach, describe, expect, it } from "vitest";
+import { cleanupCancelledPackageArtifacts, removeDownloadLinkArtifacts, removeSampleArtifacts } from "../src/main/cleanup";
+
+const tempDirs: string[] = [];
+
+afterEach(() => {
+  for (const dir of tempDirs.splice(0)) {
+    fs.rmSync(dir, { recursive: true, force: true });
+  }
+});
+
+describe("cleanup", () => {
+  it("removes archive artifacts but keeps media", () => {
+    const dir = fs.mkdtempSync(path.join(os.tmpdir(), "rd-clean-"));
+    tempDirs.push(dir);
+    fs.writeFileSync(path.join(dir, "release.part1.rar"), "x");
+    fs.writeFileSync(path.join(dir, "movie.mkv"), "x");
+
+    const removed = cleanupCancelledPackageArtifacts(dir);
+    expect(removed).toBeGreaterThan(0);
+    expect(fs.existsSync(path.join(dir, "release.part1.rar"))).toBe(false);
+    expect(fs.existsSync(path.join(dir, "movie.mkv"))).toBe(true);
+  });
+
+  it("removes sample artifacts and link files", () => {
+    const dir = fs.mkdtempSync(path.join(os.tmpdir(), "rd-clean-"));
+    tempDirs.push(dir);
+    fs.mkdirSync(path.join(dir, "Samples"), { recursive: true });
+    fs.writeFileSync(path.join(dir, "Samples", "demo-sample.mkv"), "x");
+    fs.writeFileSync(path.join(dir, "download_links.txt"), "https://example.com/a\n");
+
+    const links = removeDownloadLinkArtifacts(dir);
+    const samples = removeSampleArtifacts(dir);
+    expect(links).toBeGreaterThan(0);
+    expect(samples.files + samples.dirs).toBeGreaterThan(0);
+  });
+});