Theorem v1.4.3

Fixed

• Settings panel hidden by bottom bar on mobile — The FloatingPanel (used for reader settings, bookmarks, TOC, etc.) was rendered with z-[var(--z-dropdown)] (z-50) while the reader's bottom navigation bar uses z-[140]. On mobile, where the panel slides up as a full-width bottom sheet, the navbar was painting on top of it, cropping off the bottom portion. Raised FloatingPanel to z-[150] to ensure it always appears above the reader chrome.
• Touch highlight toolbar flash / selection glitch — When dragging to extend a text selection on touch devices, selectionchange was firing continuously mid-drag, causing the HighlightColorPicker toolbar to appear and disappear repeatedly (visible flicker). The selection capture is now deferred: touchstart sets an isTouchActive flag and selectionchange only updates the navigation lock during an active touch gesture; the actual callback is processed exactly once on touchend. This eliminates the mid-drag toolbar flash. Based on the same deferred-popup pattern used by Readest.
• iOS native callout menu obscuring highlight toolbar — Added -webkit-touch-callout: none to the reader iframe CSS. On iOS, this suppresses the system "Look Up / Copy / Share" bubble that appeared over Theorem's own HighlightColorPicker toolbar after text selection. Native selection handles and the magnifying loupe remain fully functional.