docs: fix code examples in advanced-usage.mdx

[wo-o29]

Summary

This PR fixes three documentation issues in the advanced-usage.mdx file with incorrect or outdated code examples.

Changes

1. Fixed reset defaultValues usage in "Controlled mixed with Uncontrolled Components" section

   • Changed reset({ defaultValues }) to reset({ ...defaultValues })
   • The reset function expects the values directly, not wrapped in an object

2. Updated register API syntax in "Custom Register" example

   • Changed register({ name: "select" }) to register("select")
   • Simplified to match current API where field name is passed as first argument

3. Added style prop to virtualized list example in "Working with virtualized lists" section

   • Added style={style} to the WindowedRow component's return statement
   • Wrapped input in a div with proper styling for react-window compatibility
   • Matches the CodeSandbox example implementation

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