add frontend skills

skills/extract/SKILL.md

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+---
+name: extract
+description: Extract and consolidate reusable components, design tokens, and patterns into your design system. Identifies opportunities for systematic reuse and enriches your component library.
+user-invokable: true
+args:
+  - name: target
+    description: The feature, component, or area to extract from (optional)
+    required: false
+---
+
+Identify reusable patterns, components, and design tokens, then extract and consolidate them into the design system for systematic reuse.
+
+## Discover
+
+Analyze the target area to identify extraction opportunities:
+
+1. **Find the design system**: Locate your design system, component library, or shared UI directory (grep for "design system", "ui", "components", etc.). Understand its structure:
+   - Component organization and naming conventions
+   - Design token structure (if any)
+   - Documentation patterns
+   - Import/export conventions
+   
+   **CRITICAL**: If no design system exists, ask before creating one. Understand the preferred location and structure first.
+
+2. **Identify patterns**: Look for:
+   - **Repeated components**: Similar UI patterns used multiple times (buttons, cards, inputs, etc.)
+   - **Hard-coded values**: Colors, spacing, typography, shadows that should be tokens
+   - **Inconsistent variations**: Multiple implementations of the same concept (3 different button styles)
+   - **Reusable patterns**: Layout patterns, composition patterns, interaction patterns worth systematizing
+
+3. **Assess value**: Not everything should be extracted. Consider:
+   - Is this used 3+ times, or likely to be reused?
+   - Would systematizing this improve consistency?
+   - Is this a general pattern or context-specific?
+   - What's the maintenance cost vs benefit?
+
+## Plan Extraction
+
+Create a systematic extraction plan:
+
+- **Components to extract**: Which UI elements become reusable components?
+- **Tokens to create**: Which hard-coded values become design tokens?
+- **Variants to support**: What variations does each component need?
+- **Naming conventions**: Component names, token names, prop names that match existing patterns
+- **Migration path**: How to refactor existing uses to consume the new shared versions
+
+**IMPORTANT**: Design systems grow incrementally. Extract what's clearly reusable now, not everything that might someday be reusable.
+
+## Extract & Enrich
+
+Build improved, reusable versions:
+
+- **Components**: Create well-designed components with:
+  - Clear props API with sensible defaults
+  - Proper variants for different use cases
+  - Accessibility built in (ARIA, keyboard navigation, focus management)
+  - Documentation and usage examples
+  
+- **Design tokens**: Create tokens with:
+  - Clear naming (primitive vs semantic)
+  - Proper hierarchy and organization
+  - Documentation of when to use each token
+  
+- **Patterns**: Document patterns with:
+  - When to use this pattern
+  - Code examples
+  - Variations and combinations
+
+**NEVER**:
+- Extract one-off, context-specific implementations without generalization
+- Create components so generic they're useless
+- Extract without considering existing design system conventions
+- Skip proper TypeScript types or prop documentation
+- Create tokens for every single value (tokens should have semantic meaning)
+
+## Migrate
+
+Replace existing uses with the new shared versions:
+
+- **Find all instances**: Search for the patterns you've extracted
+- **Replace systematically**: Update each use to consume the shared version
+- **Test thoroughly**: Ensure visual and functional parity
+- **Delete dead code**: Remove the old implementations
+
+## Document
+
+Update design system documentation:
+
+- Add new components to the component library
+- Document token usage and values
+- Add examples and guidelines
+- Update any Storybook or component catalog
+
+Remember: A good design system is a living system. Extract patterns as they emerge, enrich them thoughtfully, and maintain them consistently.