Note history page

Route: GET /wiki/:wikiSlug/:noteSlug/history. Link from the note page (header area, next to Edit). diff-match-patch should help for this task.

First version (keep simple):

• Reverse-chronological list of revisions: author handle, date, description (already captured when editing now)
• Each revision shows its diff inline, jj-style: unchanged text as context, deletions in red, insertions in green, at the word/character level
• No rollback/revert button
• No two-revision comparison