feat: add polyline annotation #55
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A new polyline annotation was added. It allows users to place points one by one to form a polyline, with a temporary preview line displayed while drawing, and to complete the shape by double-clicking. Once created, the line shows small “pin” anchors that can be dragged to adjust each point, and any style changes or edits are automatically saved. Additionally, an export parser was built so that when annotations are saved back to PDF, polylines are written as proper PolyLine annotations, and clouds are written as Ink annotations. The decoder was edited to handle both PolyLine and Cloud annotations.