Reading profiles and mobile dashboard

Reading profile - a new personal reading profile lets you track which books you've read or are reading. Mark books from their detail page or manage them all from the reading profile dashboard with search and series grouping.

Mobile dashboard - a new navigation drawer (accessible via floating menu button) replaces the old two-item nav cards, giving full sidebar access on mobile devices.

Caching overhaul - comprehensive audit addressing cross-request caching gaps, N+1 queries, and missing cache invalidation across the platform.

Universe reading orders - curators can now select which series reading order is used when expanding a series within a universe reading order.