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Added a draggable divider for adjusting the width ratio between TOC and the main content

Added settings related to TOC and main content areas

Added infinite scroll mode (can be enabled in settings)

Added an option to enable custom cursor

Added manual title marking feature (see help center)

Added PageUp/PageDown shortcut keys

Added help center button (can be disabled in settings)

Removed the dashed border from the main interface

Added an animated dashed border (displayed when dragging or selecting files)

Improved settings menu styles and layout

Fixed various UI issues