Refactor the skill editor state management from a standalone Zustand store
with Context provider pattern to a slice injection pattern that integrates
with the existing workflow store. This aligns with how rag-pipeline already
injects its slice.
- Remove SkillEditorProvider and SkillEditorContext
- Export createSkillEditorSlice for injection into workflow store
- Update all components to use useStore/useWorkflowStore from workflow store
- Add SkillEditorSliceShape to SliceFromInjection union type
- Use type-safe slice creator args without any types
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