Add an autoformatter.

Seems fine.

package-lock.json

@@ -23,6 +23,9 @@
         "react-scripts": "5.0.1",
         "typescript": "^4.9.5",
         "web-vitals": "^2.1.4"
+      },
+      "devDependencies": {
+        "prettier": "3.3.3"
       }
     },
     "node_modules/@adobe/css-tools": {
@@ -14400,6 +14403,21 @@
         "node": ">= 0.8.0"
       }
     },
+    "node_modules/prettier": {
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.3.3.tgz",
+      "integrity": "sha512-i2tDNA0O5IrMO757lfrdQZCc2jPNDVntV0m/+4whiDfWaTKfMNgR7Qz0NAeGz/nRqF4m5/6CLzbP4/liHt12Ew==",
+      "dev": true,
+      "bin": {
+        "prettier": "bin/prettier.cjs"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    },
     "node_modules/pretty-bytes": {
       "version": "5.6.0",
       "resolved": "https://registry.npmjs.org/pretty-bytes/-/pretty-bytes-5.6.0.tgz",