fix(update): verify and apply the actual latest version

tests/app-version.test.ts

@@ -0,0 +1,31 @@
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { afterEach, describe, expect, it } from "vitest";
+import { resolveRuntimeAppVersion } from "../src/main/app-version";
+
+const tempDirs: string[] = [];
+
+afterEach(() => {
+  for (const dir of tempDirs.splice(0)) {
+    fs.rmSync(dir, { recursive: true, force: true });
+  }
+});
+
+describe("runtime app version", () => {
+  it("uses the version from the installed app package instead of a stale bundled fallback", () => {
+    const resourcesPath = fs.mkdtempSync(path.join(os.tmpdir(), "mdd-version-"));
+    tempDirs.push(resourcesPath);
+    fs.mkdirSync(path.join(resourcesPath, "app.asar"));
+    fs.writeFileSync(path.join(resourcesPath, "app.asar", "package.json"), JSON.stringify({ version: "2.0.51" }), "utf8");
+
+    expect(resolveRuntimeAppVersion("2.0.50", resourcesPath)).toBe("2.0.51");
+  });
+
+  it("uses the bundled fallback when no installed package metadata is available", () => {
+    const resourcesPath = fs.mkdtempSync(path.join(os.tmpdir(), "mdd-version-"));
+    tempDirs.push(resourcesPath);
+
+    expect(resolveRuntimeAppVersion("2.0.51", resourcesPath)).toBe("2.0.51");
+  });
+});