chore: add changeset for main.ts import fix

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

Author: Seungwoo321

.changeset/fix-main-import-reference.md

@@ -0,0 +1,7 @@
+---
+"vue-pivottable": patch
+---
+
+Fix main.ts import reference issue and optimize memory usage
+
+Fixed undefined SimpleApp reference to use App component in main.ts entry point. This resolves runtime errors and improves application startup reliability.