fix(desktop): warn about Rosetta installs on Apple Silicon (#621)

* fix(desktop): warn about Rosetta installs on Apple Silicon

* docs: note workspace build sync before type fixes

packages/desktop/src/system/arm64-translation.test.ts

@@ -0,0 +1,59 @@
+import { describe, expect, it, vi } from "vitest";
+import { detectRunningUnderARM64Translation } from "./arm64-translation";
+
+describe("detectRunningUnderARM64Translation", () => {
+  it("returns false outside macOS without probing sysctl", () => {
+    const execFileSyncImpl = vi.fn();
+
+    expect(
+      detectRunningUnderARM64Translation({
+        platform: "linux",
+        electronReportedTranslation: true,
+        execFileSyncImpl,
+      }),
+    ).toBe(false);
+    expect(execFileSyncImpl).not.toHaveBeenCalled();
+  });
+
+  it("trusts Electron when it reports ARM64 translation", () => {
+    const execFileSyncImpl = vi.fn();
+
+    expect(
+      detectRunningUnderARM64Translation({
+        platform: "darwin",
+        electronReportedTranslation: true,
+        execFileSyncImpl,
+      }),
+    ).toBe(true);
+    expect(execFileSyncImpl).not.toHaveBeenCalled();
+  });
+
+  it("falls back to sysctl when Electron does not report translation", () => {
+    const execFileSyncImpl = vi.fn(() => "1\n");
+
+    expect(
+      detectRunningUnderARM64Translation({
+        platform: "darwin",
+        electronReportedTranslation: false,
+        execFileSyncImpl,
+      }),
+    ).toBe(true);
+    expect(execFileSyncImpl).toHaveBeenCalledWith("sysctl", ["-in", "sysctl.proc_translated"], {
+      encoding: "utf-8",
+      timeout: 1000,
+    });
+  });
+
+  it("treats missing sysctl support as not translated", () => {
+    const execFileSyncImpl = vi.fn(() => {
+      throw new Error("unknown oid");
+    });
+
+    expect(
+      detectRunningUnderARM64Translation({
+        platform: "darwin",
+        execFileSyncImpl,
+      }),
+    ).toBe(false);
+  });
+});