feat(site): horário — esconde botão ao abrir, setas no desktop, swipe no telemóvel

- "Ver Horário das aulas" desaparece assim que o acordeão abre (clique no
  próprio botão ou o link "Horário" da navbar a abrir por JS) — deixa de
  ficar um botão grande por cima da grelha já visível.
- Setas ‹ › junto ao dia em foco também no desktop (vista de 3 dias): só o
  dia central as mostra, os laterais continuam sem elas (já são clicáveis
  diretamente).
- Deslizar no telemóvel/tablet muda de dia, com o mesmo efeito das setas —
  só reage a arrastos maioritariamente horizontais, para não roubar o
  scroll vertical da página.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

site/assets/css/style.css

@@ -2725,7 +2725,9 @@ h3.contact-title {
   align-items: center;
 }
 
-.schedule.is-3day .sched-nav,
+/* Desktop 3-day view: arrows stay only beside the centred/focused day —
+   the side days are already directly clickable, arrows there would be noise. */
+.schedule.is-3day .schedule_dayhead.sched-side .sched-nav,
 .schedule-export .sched-nav {
   display: none;
 }
@@ -2843,6 +2845,10 @@ h3.contact-title {
   .schedule.is-3day:not(.schedule-export) .schedule_dayhead.sched-side {
     cursor: pointer;
   }
+  .schedule.is-3day:not(.schedule-export) .schedule_dayhead.sched-pos-2 {
+    gap: 10px;
+    align-items: center;
+  }
 }
 
 /* ── Aula experimental modal ───────────────────────────────────────────────── */

site/assets/js/main.js

@@ -446,6 +446,24 @@ document.addEventListener('DOMContentLoaded', function () {
     var reflow = function () { if (current) showDay(current); };
     if (wide.addEventListener) wide.addEventListener('change', reflow); else if (wide.addListener) wide.addListener(reflow);
 
+    // Swipe left/right on phones/tablets to change day — same effect as the
+    // arrows. Only acts on mostly-horizontal drags, so a vertical page scroll
+    // starting over the schedule is never hijacked.
+    var touchStart = null;
+    var container = scope.querySelector('.schedule_container') || scope;
+    container.addEventListener('touchstart', function (e) {
+        var t = e.changedTouches[0];
+        touchStart = { x: t.clientX, y: t.clientY };
+    }, { passive: true });
+    container.addEventListener('touchend', function (e) {
+        if (!touchStart) return;
+        var t = e.changedTouches[0];
+        var dx = t.clientX - touchStart.x, dy = t.clientY - touchStart.y;
+        touchStart = null;
+        if (Math.abs(dx) < 40 || Math.abs(dx) < Math.abs(dy) * 1.5) return;
+        step(dx < 0 ? 1 : -1);
+    }, { passive: true });
+
     // Pre-select today when the schedule has a header for it (PT day names),
     // otherwise the first day.
     var ptDays = { 1: 'segunda', 2: 'terça', 3: 'quarta', 4: 'quinta', 5: 'sexta', 6: 'sábado' };
@@ -454,6 +472,22 @@ document.addEventListener('DOMContentLoaded', function () {
     if (start) showDay(start);
 });
 
+/* ── Horário: hide the "Ver Horário das aulas" toggle once open ─────────────
+   The button's only job is opening the accordion — once it has, leaving it
+   sitting above the now-visible schedule is dead weight (and confusing when
+   the navbar link opened it without a click on the button itself). */
+document.addEventListener('DOMContentLoaded', function () {
+    document.querySelectorAll('.collapse[id^="horarioCollapse"]').forEach(function (el) {
+        var toggles = document.querySelectorAll('[data-bs-toggle="collapse"][data-bs-target="#' + el.id + '"]');
+        el.addEventListener('shown.bs.collapse', function () {
+            toggles.forEach(function (b) { b.hidden = true; });
+        });
+        el.addEventListener('hidden.bs.collapse', function () {
+            toggles.forEach(function (b) { b.hidden = false; });
+        });
+    });
+});
+
 /* ── Equipa: detail card that grows out of the tile ─────────────────────────
    Desktop: hover (or keyboard focus) opens. The card is laid exactly over the
    tile photo, tilted like it, and the CSS unclips/straightens it sideways —