- require a score and return a clear message for empty/non-numeric values
- handle unreadable API request bodies instead of falling back to a bare 400
- submit the grade modal via fetch, show errors in place and update the cell
- keep the page scroll position; restore the form feedback tests
- Lab page is now read-only with a settings screen for levels/variants;
variant issuance moved to a large modal on the group page (assign-fragment).
- Header: bordeaux logo and 2px accent underline, bordeaux login/logout/theme
buttons; smaller radii across the UI; filled secondary/danger buttons.
- Includes prior agent work (login backoff, no-cache pages, API timeouts,
content tweaks) and fixes (variant usage Map.values, import order).
- Bump static asset version to v=9.
