fix: await virtual display initialization

[matus01]

Summary

Fixes a Linux launch failure where the virtual display value is passed as a Promise instead of the resolved display string.

Problem

When creating a browser tab on Linux, Camoufox failed to launch with:

Error: cannot open display: [object Promise]

The /tabs request then returned 500.

The log also showed the virtual display value as an object:

"xvfb virtual display started","display":{}

Cause

VirtualDisplay.get() returns a Promise, but the result was used without await:

vdDisplay = localVirtualDisplay.get();

As a result, vdDisplay contained a Promise object instead of the actual Xvfb display string.

Fix

Await the virtual display initialization:

vdDisplay = await localVirtualDisplay.get();

Testing

Tested locally on Linux with @askjo/camofox-browser 1.11.2.

Before the change, browser launch failed with:

Error: cannot open display: [object Promise]

After the change, the server was able to create browser tabs successfully.