docs: add summary for python type hint article (#325)

Author: shunk031

content/post/saving-everything-python-typehint/index.md

@@ -3,7 +3,7 @@
 
 title: "On Python Type Hints that Save Everything!"
 subtitle: ""
-summary: ""
+summary: "This article introduces the background, concepts, practical usage, and benefits of Python type hints, explaining how they enhance readability, maintainability, and development efficiency while preserving the flexibility of dynamic typing."
 authors: ["Shunsuke Kitada"]
 tags: []
 categories: []