fix: correct AppType parameter usage for TypeScript

[harikapadia999]

Description

Fixes #42846

The AppType generic parameter P was incorrectly used as InitialProps instead of PageProps. This fix properly uses AppInitialProps<PageProps> for the InitialProps parameter to match the actual structure where pageProps is wrapped in an object.

Changes

Before:

export type AppType<P = {}> = NextComponentType<
  AppContextType,
  P,
  AppPropsType<any, P>
>

After:

export type AppType<PageProps = {}> = NextComponentType<
  AppContextType,
  AppInitialProps<PageProps>,
  AppPropsType<any, PageProps>
>

Why This Fix?

According to NextComponentType definition:

• 1st param: Context
• 2nd param: InitialProps (should be AppInitialProps<PageProps>)
• 3rd param: Props (already correctly using AppPropsType<any, PageProps>)

The parameter name is also changed from P to PageProps for clarity.

Testing

• TypeScript compilation passes
• Type definitions now correctly reflect the actual structure

[nextjs-bot]

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