Task lists, export & Face ID lock

• Checkable task lists: task boxes in the Reader are tappable, changes save immediately
• Export sheet: share pages, chapters and books as PDF, Markdown, plain text or HTML
• Smarter wiki links: internal BookStack links open the target page in-app
• Code blocks with syntax highlighting and a copy button
• Biometric app lock with configurable grace period
• Recycle Bin tab: restore or permanently delete items from one place
• Cross-promotion: a dedicated detail view for sibling apps
• Iris is the new default theme, theme selection now sticks across launches