update

Author: taohsu

components/indicator/badge/badge_count/dsm/guideline/definition.md

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-🚧 Missing from source: Definition section in badge_count_overview.md
+The Badge is a small UI element used to highlight status, notifications, or categorization within an interface. It is often displayed as a label or indicator with a distinct background color and text.
+
+Usage: Display numerical values (e.g., unread messages, notifications).