chore: remove unused @coral-xyz/spl-token dependency

The nft-meta-data-pointer Next.js app declared @coral-xyz/spl-token 0.30.0
but never imported from it — grep for '@coral-xyz/spl-token' across the
app finds zero source references. @solana/spl-token ^0.4.0 is already a
dependency, so anything that needed SPL Token functionality was using
the canonical package.

Removing the dead dependency eliminates the last live @coral-xyz usage
in the repository (confirmed with repo-wide grep excluding node_modules
and .reference/). Aligns with the skill rule to use @solana/* namespaces
rather than legacy @coral-xyz/* mirrors.

Author: mikemaccana-edwardbot

tokens/token-extensions/nft-meta-data-pointer/anchor-example/app/package.json

@@ -12,7 +12,6 @@
     "@chakra-ui/next-js": "^2.1.3",
     "@chakra-ui/react": "^2.6.1",
     "@anchor-lang/core": "1.0.0",
-    "@coral-xyz/spl-token": "0.30.0",
     "@emotion/react": "^11.11.0",
     "@emotion/styled": "^11.11.0",
     "@magicblock-labs/gum-react-sdk": "^3.0.4",