The Plugins page on the welcome screen showed "[object Object]" and "There
is no online plugin repository" (even with a marketplace configured), and
Install did nothing.
- Marketplace and package commands (index, download, unpack, install
preview, theme import) only touch the IDE's own state and are allowed
without a trusted project.
- Installing, uninstalling, enabling and granting plugins are allowed
where no project is open; an untrusted project still blocks them.
- Errors rejected as plain backend error objects show their message, and
a marketplace that couldn't be read shows the error instead of the
"no online repository" note.