v1.8.49

Quick fixes from v1.8.48

Cover Cache Fix

• Covers update automatically when changed on server (no refresh needed)
• Fixed stale covers in series sheet, author sheet, and series tab
• Socket item_updated events now bust cover cache immediately

Sub-Series Grouping

• Hybrid approach: fast client-side for small series, server-side for large
• Parent series excluded to prevent circular grouping
• Books sorted by sub-series sequence when expanded
• Grid spacing tightened

Account Sheet

• Redesigned user button with gradient accent
• Account info shows server, type, library count, server version
• Cleaner layout without avatars