🔧 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).

.vscode/settings.json

@@ -9,14 +9,27 @@
         "editor.formatOnSave": true
     },
     "[json]": {
-        "editor.defaultFormatter": "esbenp.prettier-vscode",
+        "editor.defaultFormatter": "oxc.oxc-vscode",
+        "editor.formatOnSave": true
+    },
+    "[jsonc]": {
+        "editor.defaultFormatter": "oxc.oxc-vscode",
+        "editor.formatOnSave": true
+    },
+    "[markdown]": {
+        "editor.defaultFormatter": "oxc.oxc-vscode",
         "editor.formatOnSave": true
     },
     "[mdx]": {
-        "editor.defaultFormatter": "esbenp.prettier-vscode",
+        "editor.defaultFormatter": "oxc.oxc-vscode",
+        "editor.formatOnSave": true
+    },
+    "[yaml]": {
+        "editor.defaultFormatter": "oxc.oxc-vscode",
         "editor.formatOnSave": true
     },
     "editor.defaultFormatter": "oxc.oxc-vscode",
     "editor.formatOnSave": true,
     "js/ts.tsdk.path": "node_modules/typescript/lib"
 }
+