Add 3% platform fee to wizard invoice + printable invoice on success

- Invoice now includes service_fee_amount via PlatformFeeService (3% env-configurable)
- Review step and payment step both show fee breakdown (subtotal + service fee = total)
- Payment records the full total (including fee), not just the program price
- Success screen shows a proper printable invoice with items table, totals breakdown,
  payment status badge, and a print button that hides nav/sidebar
- Stores invoiceId for the computed invoiceForPrint property
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Livewire/Receptionist/NewRegistrationWizard.php

@@ -2,6 +2,7 @@
 
 namespace App\Livewire\Receptionist;
 
+use App\Domain\Financial\Models\Invoice;
 use App\Domain\Financial\Services\InvoiceService;
 use App\Domain\Financial\Services\PaymentService;
 use App\Domain\Identity\Models\Branch;
@@ -13,6 +14,7 @@
 use App\Domain\Participant\Services\ParticipantService;
 use App\Domain\Pricing\Models\BasePrice;
 use App\Domain\Shared\Exceptions\DomainException;
+use App\Domain\Shared\Services\PlatformFeeService;
 use App\Domain\Shared\Traits\UsesBranchScope;
 use App\Domain\Training\Models\Activity;
 use App\Domain\Training\Models\TrainingProgram;
@@ -70,6 +72,7 @@ class NewRegistrationWizard extends Component
     public ?string $enrollment_summary = null;
     public ?int $invoice_amount = null;
     public ?string $invoice_number = null;
+    public ?int $invoiceId = null;
     public bool $payment_recorded = false;
 
     // Pre-flight errors — blocks wizard from starting
@@ -351,8 +354,11 @@ public function confirm(): void
                     $actor
                 );
 
-                // 7. Look up the price for this program
+                // 7. Look up the price for this program + calculate platform fee
                 $feeAmount = $this->resolveProgramFee($program);
+                $platformFeeService = app(PlatformFeeService::class);
+                $serviceFee = $platformFeeService->calculate($feeAmount);
+                $totalWithFee = $feeAmount + $serviceFee;
 
                 // 8. Create invoice if there's a fee
                 $invoice = null;
@@ -368,7 +374,8 @@ public function confirm(): void
                         'subtotal_amount' => $feeAmount,
                         'discount_amount' => 0,
                         'tax_amount' => 0,
-                        'total_amount' => $feeAmount,
+                        'service_fee_amount' => $serviceFee,
+                        'total_amount' => $totalWithFee,
                         'currency' => 'EGP',
                         'issue_date' => now()->toDateString(),
                         'due_date' => now()->addDays(7)->toDateString(),
@@ -389,8 +396,9 @@ public function confirm(): void
                     // Link enrollment to invoice
                     $enrollment->update(['invoice_id' => $invoice->id]);
 
-                    $this->invoice_amount = $feeAmount;
+                    $this->invoice_amount = $invoice->total_amount;
                     $this->invoice_number = $invoice->number;
+                    $this->invoiceId = $invoice->id;
 
                     // 9. Record payment if paying now
                     if ($this->pay_now) {
@@ -403,7 +411,7 @@ public function confirm(): void
                             'method' => $this->payment_method,
                             'payer_type' => Participant::class,
                             'payer_id' => $participant->id,
-                            'amount' => $feeAmount,
+                            'amount' => $invoice->total_amount,
                             'currency' => 'EGP',
                             'payment_date' => now()->toDateString(),
                             'notes' => 'دفع اشتراك: ' . $program->name_ar,
@@ -479,6 +487,24 @@ public function getSelectedProgramFeeProperty(): int
         return $program ? $this->resolveProgramFee($program) : 0;
     }
 
+    public function getPlatformFeeProperty(): int
+    {
+        return app(PlatformFeeService::class)->calculate($this->selectedProgramFee);
+    }
+
+    public function getTotalWithFeeProperty(): int
+    {
+        return $this->selectedProgramFee + $this->platformFee;
+    }
+
+    public function getInvoiceForPrintProperty(): ?Invoice
+    {
+        if (!$this->invoiceId) {
+            return null;
+        }
+        return Invoice::with('items')->find($this->invoiceId);
+    }
+
     public function render()
     {
         $activities = Activity::where('is_active', true)->orderBy('name_ar')->get();