fix(gitignore): fix malformed line that merged .DS_Store and examples/*.epub

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: zhonghui

.gitignore

@@ -11,4 +11,5 @@ angular-main/
 
 # Book project output (generated content, project-specific)
 output/.DS_Store
-.DS_Storeexamples/*.epub
+.DS_Store
+examples/*.epub