Also fixes a CSS specificity bug found during manual browser testing:
.chapter-form { display: flex } has the same specificity as the browser's
built-in [hidden] { display: none } rule and wins by cascade order, so the
per-card chapter-edit form stayed visible even with the hidden attribute
set. Added .chapter-form[hidden] { display: none } alongside the existing
.card[hidden] override.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
sulthan