[bugfix] Fix Storybook builder require() error by converting main.ts to main.mjs

- Convert .storybook/main.ts to main.mjs to resolve ES module compatibility
- Use dynamic imports instead of static imports to avoid require() errors
- Add .storybook directory to tsconfig.json includes
- Storybook build and dev server now work correctly

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

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

tsconfig.json

@@ -37,6 +37,7 @@
     "src/types/**/*.d.ts",
     "tests-ui/**/*",
     "global.d.ts",
-    "vite.config.mts"
+    "vite.config.mts",
+    ".storybook/**/*"
   ]
 }