Site polish: tighter modalidades spacing, less schedule redundancy, plan section styling

- Modalidades: reduce gap between cards
- Horário: drop the day-title above the grid in single-day mode (the active
  day-filter button already names it); restyle "Guardar horário" as a plain
  link and drop the "(JPG)" suffix
- Mensalidades: give "Escolhe o teu plano" the same dark hammered-metal
  background as the reviews/footer sections instead of the plain light one

site/index.php

@@ -264,7 +264,7 @@ if (!in_array($default_day, $week_values, true)) { $default_day = $week_values[0
                 </div>
                 <div class="text-center mb-2">
                     <button type="button" class="schedule-dl-btn" id="scheduleDownload">
-                        <i class="fas fa-download" aria-hidden="true"></i> Guardar horário (JPG)
+                        <i class="fas fa-download" aria-hidden="true"></i> Guardar horário
                     </button>
                 </div>
             </div>