feat: add signer name and title fields to invoices with toggleable UI visibility

database/migrations/2026_04_05_000002_add_signer_details_to_invoices.php

@@ -0,0 +1,23 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('invoices', function (Blueprint $table) {
+            $table->string('signer_name')->nullable()->after('signature_image');
+            $table->string('signer_title')->nullable()->after('signer_name');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('invoices', function (Blueprint $table) {
+            $table->dropColumn(['signer_name', 'signer_title']);
+        });
+    }
+};