* fix(webworker): load plugin manager and HMR in the preview Worker
The Worker disabled both rows, which left Creator mode's
tool-plugin-manager waiting for its service and the Plugins page without
a manageable profile. Only package commands are unavailable; the
services load. The Worker provides appReady from its own readiness
promise, resolved once the tunnel serves, and its process shim reports
no entry script, so HMR keeps only its profile configuration watches.
Fixes#5372
* fix(webworker): show xdg-open text files in a preview viewer
The Worker implements xdg-open as a platform executable that sends one
VFS text file to the page, which shows it in a read-only modal dialog.
Settings' "Open configuration file" now opens the profile patch in the
preview instead of failing on a missing desktop opener.
Fixes#5371
Turtle