[Bug]: Hop Web project switch can reset VFS namespaces of other sessions

[cxhttt233]

Apache Hop version?

SNAPSHOT-20260901

Java version?

21

Operating system

Docker

What happened?

After #8119, Hop Web uses a separate VFS namespace for each session.
However, switching/enabling a project still calls:
ProjectsUtil.enableProject() → HopVfs.setBootstrapVariables()
If named VFS providers were already registered, setBootstrapVariables() calls the global HopVfs.reset().
HopVfs.reset() calls HopVfsNamespaces.reset(), which closes all existing VFS namespaces in the JVM.
As a result, enabling a project in session B can invalidate the VFS namespace currently used by session A.
This appears to be a remaining global reset path after #8119.

Codex suggests this cause, but it still needs confirmation.

Issue Priority

Priority: 2

Issue Component

Component: Hop Web

[hansva]

.take-issue
Investigating this because that's exactly what we want to avoid ofcourse