🤖 fix: honor muxRoot when resolving userData

Author: ibetitsmike

src/desktop/userDataDir.test.ts

@@ -14,8 +14,8 @@ describe("resolveMuxUserDataDir", () => {
     expect(result).toBe("/tmp/custom-user-data");
   });
 
-  test("defaults to <muxHome>/user-data when muxRoot is set", () => {
-    const result = resolveMuxUserDataDir({ muxRoot: "/tmp/mux-root", muxHome: "/tmp/mux-root" });
+  test("defaults to <muxRoot>/user-data when muxRoot is set", () => {
+    const result = resolveMuxUserDataDir({ muxRoot: "/tmp/mux-root" });
     expect(result).toBe(path.join("/tmp/mux-root", "user-data"));
   });
 

src/desktop/userDataDir.ts

@@ -12,7 +12,9 @@ export function resolveMuxUserDataDir(options: {
   }
 
   if (options.muxRoot || options.isE2E) {
-    const muxHome = options.muxHome ?? getMuxHome();
+    // Prefer explicit inputs (muxHome / muxRoot) so callers can compute a path
+    // without mutating process.env before calling this helper.
+    const muxHome = options.muxHome ?? options.muxRoot ?? getMuxHome();
     return path.join(muxHome, "user-data");
   }