feat: restore unsaved content#161

LeVuMinhHuy wants to merge 2 commits intothien-do:mainthien-do/samuwrite:mainfrom

LeVuMinhHuy:fix/web-restore-unsaved-content-with-indexeddbLeVuMinhHuy/samuwrite.com:fix/web-restore-unsaved-content-with-indexeddbCopy head branch name to clipboard