fix(books): improve find_by_author with casefold and partial matching#65

ishizuka-nkc wants to merge 2 commits intogithub:maingithub/copilot-cli-for-beginners:mainfrom

ishizuka-nkc:fix/find-by-author-partial-matchishizuka-nkc/copilot-cli-for-beginners:fix/find-by-author-partial-matchCopy head branch name to clipboard