add prevent_overlapping_time_entries setting to organization

when enabled users are blocked from creating or editing new time entries that are overlapping with other time entries

database/migrations/2025_10_02_000001_add_prevent_overlapping_time_entries_to_organizations_table.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('organizations', function (Blueprint $table): void {
+            $table->boolean('prevent_overlapping_time_entries')->default(false)->after('employees_can_see_billable_rates');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('organizations', function (Blueprint $table): void {
+            $table->dropColumn('prevent_overlapping_time_entries');
+        });
+    }
+};