🔧 Remove Prettier from editor formatter config

Prettier is no longer a project dependency and oxc.oxc-vscode handles
formatting for all file types the project touches. Switch [json],
[jsonc], [markdown], [mdx], and [yaml] formatters from
esbenp.prettier-vscode to oxc.oxc-vscode (oxfmt under the hood,
Prettier-compatible for JS/TS and native for JSON/MD/YAML).

Drop 'esbenp' from cspell dictionary (no longer referenced).

cspell.json

@@ -14,7 +14,6 @@
         "oxlintrc",
         "sortpackagerc",
         "EDITMSG",
-        "esbenp",
         "typescriptteam"
     ],
     "ignorePaths": ["dist", "node_modules", "public", "coverage", "*.svg"]