feat(prj): add biome formatter

biome.json

@@ -0,0 +1,19 @@
+{
+  "$schema": "https://biomejs.dev/schemas/1.7.3/schema.json",
+  "formatter": {
+    "enabled": true,
+    "formatWithErrors": false,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineEnding": "lf",
+    "lineWidth": 80,
+    "attributePosition": "auto"
+  },
+  "organizeImports": { "enabled": true },
+  "linter": { "enabled": true, "rules": { "recommended": true } },
+  "vcs": {
+    "enabled": true,
+    "clientKind": "git",
+    "useIgnoreFile": true
+  }
+}

nix/devshells.nix

@@ -8,7 +8,10 @@
       ...
     }:
     let
-      commonPkgs = [ inputs'.phps.packages.env-php82 ];
+      commonPkgs = [
+        inputs'.nixpkgs-trunk.legacyPackages.biome
+        inputs'.phps.packages.env-php82
+      ];
     in
     {
       devShells = {