* fix: Add application/octet-stream as a valid mimetype for docx uploads * fix: Include application/octet-stream in frontend filter fix: Add file size and file type guards * Validate .docx extension in files with application/octet-stream mimetype * refactor: Move MAXIMUM_IMPORT_SIZE to an optional environment config fix: Add file size check on server too Co-authored-by: Saumya Pandey <sp160899@gmail.com>