- GET /versions lists the automatic backups of the selected file (timestamp,
size); ?show=<backup> renders a line diff against the current content
- POST /restore validates the backup against the content schema and restores
it atomically; the pre-restore state gets a fresh backup first, so a
restore itself is reversible; audited as version_restored
- dependency-free LCS line diff (scripts/cms-diff.js) with add/del
highlighting and context trimming; backup names validated against a strict
pattern (path traversal impossible)
- new 🕘 Verziók entry in the CMS bottom bar
- refactor: security/infra helpers extracted to scripts/cms-core.js to keep
content-editor.js under the 400-line hard limit
- integration test: list, diff, restore + reversibility backup, traversal
rejection, CSRF enforcement, auth
Closes MITHOME-64
