Feature request: support multiple project previews open simultaneously in the Preview window

Summary

The Preview window currently only supports viewing one project at a time. When working across multiple projects simultaneously (e.g. different Claude Code sessions), it should be easy to have previews for multiple projects open at once.

Requested features

• Tabs or a switcher in the Preview window to move between previews for different projects/servers
• Each tab tied to its respective project's dev server
• Quick-switch without having to stop/start servers

Expected behavior

The Preview window has tabs (or a dropdown) listing all currently running preview servers. Clicking a tab switches the view to that project's preview without closing the others.

Current behavior

Only one preview can be active at a time. Switching projects requires navigating away and loses context on the previous preview.

Use case

Users running agents across multiple projects simultaneously need to quickly check the visual state of each project's UI without hunting through separate windows or restarting servers.