WR-04: cut each long text of the review context view model to an
escaped-byte budget, so a 20000-character answer of characters that
html/template expands to 5 bytes can no longer push the partial over
64 KiB. Ordinary answers stay whole; a cut text gets a note pointing to
quizzes_review_show.
- Do oceny admin screen (golem15.quizzes.reviews) over the open answers,
with a read-only context partial, score and comment virtual fields saved
through SetScore, confirm and regrade record actions, bulk confirm
- open question type, rubric and max_length in the question form; grader
dropdown on the quiz form from the grader registry
- Review model with quiz, status and student filters
