Add title sections to invoices backend and frontend, #41

database/migrations/2025_09_18_193251_create_line_items_table.php

@@ -14,7 +14,8 @@ public function up(): void
         Schema::create('line_items', function (Blueprint $table) {
             $table->id();
             $table->foreignId('invoice_id')->constrained()->onDelete('cascade');
-            $table->integer('position')->default(0);
+            $table->decimal('position', 10, 2)->default(0);
+            $table->boolean('is_section')->default(false);
             $table->string('title')->nullable();
             $table->string('description')->nullable();
             $table->integer('quantity')->default(1);