enable paste image and add 3 choices to copy, fix GUI bug - Unit Tests#1

CodeBeaverDemo wants to merge 2 commits intomainCodeBeaverDemo/LaTeX-OCR:mainfrom

codebeaver/optimize_streamlit_and_fix_GUI_bug-403CodeBeaverDemo/LaTeX-OCR:codebeaver/optimize_streamlit_and_fix_GUI_bug-403Copy head branch name to clipboard