Replaced the old drag-and-drop implementation with a custom solution using mouse events for better control and precision. Added `_isDragging` state and dynamic cursor updates to enhance user feedback during drag operations.
Introduced grab offset calculations to ensure accurate field positioning relative to the pointer. Added `OnEditorMouseUp` to reset the drag state and `GetPageSize` to retrieve page dimensions, defaulting to A4 if unavailable.
Updated `envelope-editor.js` to include `pageNumber` in `getClickCoordsOnPdfPage` and removed the obsolete `getDropCoordsOnPage` function. Enhanced `EditorCoords` to include `PageNumber` for improved page identification.
TekH
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