Redesigns the upload interface to use a two-column grid layout on larger screens, separating the file drop-zone (left) from the upload options (right). This improves usability and visual hierarchy.
Changes include:
- Increasing the upload view max-width to 64rem.
- Creating a responsive `.upload-grid` that collapses to a single column on narrow viewports.
- Stacking option fields vertically in the narrower options panel.
- Adding retro theme support for the new options title.
Modify the authentication handler to return an unauthorized error when
an invalid or disabled bearer token is provided, rather than silently
falling back to an anonymous request.
This ensures that clients attempting to authenticate but failing (due to
expired, malformed, or disabled tokens) are explicitly notified of the
auth failure instead of proceeding anonymously. True anonymous requests
without any Authorization header remain supported.
