fix(calendar): PDF programări via HTTP route, not Livewire wire:click

wire:click="exportPdf" attempted to return a binary Response through
Livewire's JSON channel — it re-encoded the PDF bytes as JSON and
triggered "Malformed UTF-8 characters, possibly incorrectly encoded".

Added GET /app/appointments/pdf?from=...&to=... that streams the PDF
with Content-Disposition: inline (or attachment when ?download=1) and
switched the calendar button to a plain <a target="_blank"> pointing
at that URL. The button now includes the currently visible period via
query params.

The old exportPdf() method is retained (still returns a plain PDF
Response) because CalendarEnhancementsTest asserts against it — it's
just no longer wired to the UI.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

routes/web.php

@@ -47,6 +47,31 @@ Route::post('/payments/paypal/webhook', [\App\Http\Controllers\PaymentController
 Route::post('/payments/paynet/webhook', [\App\Http\Controllers\PaymentController::class, 'paynetWebhook'])
     ->withoutMiddleware([\Illuminate\Foundation\Http\Middleware\VerifyCsrfToken::class]);
 
+// PDF for appointments (used by CalendarBoard "PDF programări" button).
+// Inline preview by default; ?download=1 forces attachment.
+Route::get('/app/appointments/pdf', function (Request $request) {
+    abort_unless(auth('web')->check(), 403);
+    $firstDate = $request->query('from') ?: today()->toDateString();
+    $lastDate = $request->query('to') ?: today()->toDateString();
+    $appointments = \App\Models\Tenant\Appointment::with(['client:id,name', 'vehicle:id,plate,make,model', 'master:id,name', 'post:id,name'])
+        ->whereBetween('date', [$firstDate, $lastDate])
+        ->orderBy('date')
+        ->orderBy('time_start')
+        ->get();
+    $pdf = \Barryvdh\DomPDF\Facade\Pdf::loadView('pdf.appointments', [
+        'appointments' => $appointments->groupBy(fn ($a) => $a->date->toDateString()),
+        'periodLabel' => \Carbon\Carbon::parse($firstDate)->format('d.m.Y') . ' — ' . \Carbon\Carbon::parse($lastDate)->format('d.m.Y'),
+        'generatedAt' => now()->format('d.m.Y H:i'),
+    ])->setPaper('a4', 'portrait');
+    $filename = 'programari_' . $firstDate . '_' . $lastDate . '.pdf';
+    $disposition = $request->boolean('download') ? 'attachment' : 'inline';
+    return response($pdf->output(), 200, [
+        'Content-Type' => 'application/pdf',
+        'Content-Disposition' => $disposition . '; filename="' . $filename . '"',
+        'Cache-Control' => 'private, no-store',
+    ]);
+})->name('appointments.pdf');
+
 // PDF for a work order. Inline preview by default (opens in browser tab
 // so user can print/save); forced download with ?download=1.
 Route::get('/app/work-orders/{workOrder}/pdf', function (Request $request, int $workOrder) {