Fixed

• Pasting images from clipboard with special characters in name fails silently #422
• link icon not displayed for new link when excalidraw-link-brackets: true #434
• multiple instances of save result in race condition when terminating an Excalidraw leaf caused file conflict with the backup file
• Next attempt at solving: Unable to create target link from link text #431
• Excalidraw link tooltip text remained visible after navigating to the linked page