feat: add discount management and PDF export for transmittals

- Create Discount model, migration, and Filament resource with relation to Client
- Add PDF export functionality for transmittals using DomPDF
- Include discount type selection in sales transactions
- Fix account filtering logic in expense resource
- Update export job to generate PDF instead of Excel

app/Filament/Resources/TransmittalResource.php

@@ -4,7 +4,6 @@ namespace App\Filament\Resources;
 
 use App\Commands\Transmittal\GenerateTransmittalSeries;
 use App\Commands\Transmittal\StoreTransmittalCommand;
-use App\Exports\TransmittalsExport;
 use App\Filament\Resources\TransmittalResource\Pages;
 use App\Jobs\ExportCompleteJob;
 use App\Models\Branch;
@@ -26,6 +25,7 @@ use Filament\Tables\Filters\SelectFilter;
 use Filament\Tables\Table;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Support\Arr;
+use Illuminate\Support\Facades\Auth;
 use Malzariey\FilamentDaterangepickerFilter\Filters\DateRangeFilter;
 
 class TransmittalResource extends Resource
@@ -147,13 +147,11 @@ class TransmittalResource extends Resource
 
     public static function exportTransmittal(array $id): void
     {
-        $recipient = auth()->user();
+        $recipient = Auth::user();
 
         static::generateExportNotification();
 
-        (new TransmittalsExport([$id]))->store('public/transmittal-export.xlsx')->chain([
-            app(ExportCompleteJob::class, ['user' => $recipient]),
-        ]);
+        ExportCompleteJob::dispatch($recipient, Arr::flatten($id));
     }
 
     public static function generateExportNotification(): Notification