chore: add changeset for VuePivottable props fixes

- Add changeset for patch release addressing component isolation and prop issues
- Includes fixes for undefined errors and missing required prop warnings

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: Seungwoo321

.changeset/fix-vue-pivottable-props-issue.md

@@ -0,0 +1,14 @@
+---
+"vue-pivottable": patch
+---
+
+Fix VuePivottable component props and type issues
+
+- Fix "Cannot read properties of undefined" error when using VuePivottable without VuePivottableUi
+- Remove unnecessary composables export from main index to prevent VuePivottableUi code execution
+- Make aggregatorName, renderers, rendererName optional in DefaultPropsType with proper defaults  
+- Add proper default values in VPivottable component
+- Fix TSVExportRenderers to handle undefined aggregatorName
+- Resolve Vue warning messages for missing required props
+
+This ensures VuePivottable can be used independently without requiring VuePivottableUi-specific props.