🤖 fix: Update preload path in desktop/main.ts

The preload script is built to dist/preload.js but desktop/main.js is now in dist/desktop/,
so the relative path needs to be ../preload.js instead of preload.js.

Fixes E2E tests failing to load the app - window wasn't initializing because preload couldn't be found.

Author: kylecarbs

src/desktop/main.ts

@@ -367,7 +367,7 @@ function createWindow() {
     webPreferences: {
       nodeIntegration: false,
       contextIsolation: true,
-      preload: path.join(__dirname, "preload.js"),
+      preload: path.join(__dirname, "../preload.js"),
     },
     title: "cmux - coder multiplexer",
     // Hide menu bar on Linux by default (like VS Code)