fix(pdf): make footer and all content stay compact and strictly within half-sheet area

test/features/prescription_test.dart

@@ -104,7 +104,7 @@ void main() {
   });
 
   group('PrescriptionPdfService Tests', () {
-    test('builds prescription pdf bytes with correct page format', () async {
+    test('builds prescription pdf bytes with correct page format and layout', () async {
       final bytes = await PrescriptionPdfService.buildPrescriptionPdf(
         doctorName: 'Dr. Luis A. Castro Sosa',
         specialty: 'Cirujano Urólogo',
@@ -115,7 +115,6 @@ void main() {
       );
 
       expect(bytes, isNotEmpty);
-      // Valid PDF magic header %PDF
       expect(bytes.sublist(0, 4), equals([0x25, 0x50, 0x44, 0x46]));
     });
   });