Linter: apply all recommended biome settings

Enforces previously-skipped useArrowFunction check

biome.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "https://biomejs.dev/schemas/2.3.2/schema.json",
+  "$schema": "https://biomejs.dev/schemas/2.3.3/schema.json",
   "vcs": {
     "enabled": true,
     "clientKind": "git",
@@ -11,10 +11,7 @@
   "linter": {
     "enabled": true,
     "rules": {
-      "recommended": true,
-      "complexity": {
-        "useArrowFunction": "off"
-      }
+      "recommended": true
     }
   },
   "formatter": {