Bump prettier to v3 and format all files

prettier.config.js

@@ -0,0 +1,16 @@
+// @ts-check
+
+/**
+ * @see https://prettier.io/docs/en/configuration.html
+ * @type {import('prettier').Options}
+ * */
+const config = {
+  semi: true,
+  trailingComma: 'all',
+  singleQuote: true,
+  printWidth: 89,
+  tabWidth: 2,
+  embeddedLanguageFormatting: 'auto',
+};
+
+export default config;