feat: Add accent color to invoice settings and update related views; enhance event creation with brand contract option

database/migrations/2026_04_01_200000_add_accent_color_to_invoice_settings.php

@@ -0,0 +1,22 @@
+<?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('invoice_settings', function (Blueprint $table) {
+            $table->string('accent_color', 20)->default('#FFB7C5')->after('header_logo');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('invoice_settings', function (Blueprint $table) {
+            $table->dropColumn('accent_color');
+        });
+    }
+};