refactor(nix): simplify oxfmt includes to wildcard pattern

Replace explicit file extension list with wildcard pattern for oxfmt
formatter configuration. The --no-error-on-unmatched-pattern flag
handles unsupported file types gracefully, making the explicit list
unnecessary.

Author: ryoppippi

flake.nix

@@ -67,18 +67,7 @@
             settings.formatter.oxfmt = {
               command = "${pkgs.oxfmt}/bin/oxfmt";
               options = [ "--no-error-on-unmatched-pattern" ];
-              includes = [
-                "*.md"
-                "*.yml"
-                "*.yaml"
-                "*.json"
-                "*.ts"
-                "*.tsx"
-                "*.js"
-                "*.jsx"
-                "*.html"
-                "*.css"
-              ];
+              includes = [ "*" ];
               excludes = [
                 "CHANGELOG.md"
               ];