Skill for writing Storybook stories and following CSF 3.0 best practices. Use when: (1) creating new story files (.stories.tsx, .stories.ts), (2) modifying existing stories, (3) configuring Args, Decorators, or Parameters, (4) working with Storybook configuration files (.storybook/), or (5) tasks involving the keywords 'story', 'stories', 'storybook', or 'CSF'.