Moments: per-user saved pages and regions with one category (BL-0055)

Reader: bookmark button and M save the page (Flow: page at the reading
line, Book: the spread) with an optional dragged region, exactly one
category (Twist, Hot, Awesome, Cute, Funny, Feels) and a note. I now
toggles the bars; ? lists all keys. Keys dispatch through public/keys.js,
which also feeds the new Settings -> Keyboard shortcuts section.

Manga page: "Your moments" strip of crops (story or recent order,
category filters), viewer with step, full page, edit, delete and
"Open in reader" (read.html ...&p=). Moments point at pages by file
name and show "page moved" when the file is gone. Private per user.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

public/settings-nav.js

@@ -5,6 +5,7 @@ const SETTINGS_SECTIONS = [
   { id: 'user/reading', group: 'User', title: 'Reading', hint: 'Reader modes, page spacing and zoom.' },
   { id: 'user/reading-hours', group: 'User', title: 'Reading hours', hint: 'When this server allows chapter reading.' },
   { id: 'user/reading-time', group: 'User', title: 'Reading time & privacy', hint: 'Your clock, Reading Story and personal data.' },
+  { id: 'user/shortcuts', group: 'User', title: 'Keyboard shortcuts', hint: 'Every key the reader understands. Press ? in the reader for the same list.' },
   { id: 'user/notifications', group: 'User', title: 'Notifications', hint: 'Chapter alerts and your optional webhook.' },
   { id: 'user/account', group: 'User', title: 'Account', hint: 'Your account and password.' },
   { id: 'admin/scraper', group: 'Admin', title: 'Scraper', hint: 'Live activity, downloads, update checks and sources.' },