feat: replace Excel export with PDF export for transmittals

- Add new TransmittalPDFExportJob to generate PDFs using dompdf
- Remove old Excel export implementation (TransmittalsExport)
- Update ExportCompleteJob to use new PDF job instead of Excel
- Add TestQueueJob for queue testing with new route
- Update notification label from "Download File" to "Download PDF File"
- Fix auth() helper usage by importing Auth facade consistently

app/Jobs/TransmittalPDFExportJob.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace App\Jobs;
+
+use App\Models\Transmittal;
+use Barryvdh\DomPDF\Facade\Pdf;
+use Filament\Forms\Components\Actions;
+use Filament\Notifications\Livewire\Notifications;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+use Illuminate\Foundation\Queue\Queueable;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Support\Facades\Storage;
+
+class TransmittalPDFExportJob implements ShouldQueue
+{
+    use Queueable, Dispatchable, InteractsWithQueue, SerializesModels;
+
+    /**
+     * Create a new job instance.
+     */
+    public function __construct(private $user, private array $ids)
+    {}
+
+    /**
+     * Execute the job.
+     */
+    public function handle(): void
+    {
+        $transmittals = Transmittal::query()
+            ->with(['client', 'branch', 'files.notes', 'files.remarks'])
+            ->whereIn('id', $this->ids)
+            ->get();
+
+        $pdf = Pdf::loadView('transmittal.export.transmittal-export-pdf', [
+            'transmittals' => $transmittals,
+        ]);
+
+        Storage::disk('public')->put('transmittal-export.pdf', $pdf->output());
+
+        Notifications::make()
+            ->success()
+            ->title('Export Completed')
+            ->actions([
+                Actions\Action::make('download_transmittal-export.pdf')
+                    ->label('Download PDF File')
+                    ->url(Storage::url('transmittal-export.pdf'), true)
+                    ->markAsRead(),
+            ])
+            ->sendToDatabase($this->user);
+    }
+}