fix: replace any type with proper typing in CountryMap

[Durganjali-sidda]

Summary

This PR fixes a TypeScript linting issue in CountryMap.tsx.

Problem

Previously, the markerStyle.initial object was type-cast as any:

initial: {
  fill: "#465FFF",
  r: 4,
} as any
This caused the following error in VSCode:

Unexpected any. Specify a different type. (eslint@typescript-eslint/no-explicit-any)

Solution:
Replaced the any type assertion with a more specific type:
  } as { fill: string; r: number }
This removes the linting error while preserving correct typing.

Testing:
Verified project builds without TypeScript errors

Verified CountryMap renders as expected with custom marker styling