The Response.blob() method in JavaScript returns a Blob, not a File.
This means that file-specific metadata like `name` and `lastModified` is
lost. The tests were updated to reflect this by manually constructing a
File object from the Blob, mimicking how client code would handle this
conversion. The MIME type is now correctly preserved from the response
headers when creating the File.
The `admin_basepath` configuration option has been renamed to `basepath`
for clarity and consistency. This change affects how the admin base path
is accessed and utilized within the `AppReduced` utility. Tests have
been updated to reflect this renaming.
Move default option values into the constructor parameter initializer to
prevent them from being overwritten by the spread operator in
`get options()`.
Cameron Pak