feat(share): group entries by date on public /s/<token> page

public/js/share.js

@@ -239,7 +239,15 @@ function renderShare(data, password) {
   const isAnonymized = !data.show_student_names;
   const showStudentMessage = !!data.show_student_message;
   const showEntryDate = !!data.show_entry_date;
-  grid.innerHTML = data.entries.map(e => {
+  const dayKey = e => {
+    const d = new Date(e.created_at);
+    return `${d.getFullYear()}-${String(d.getMonth()+1).padStart(2,'0')}-${String(d.getDate()).padStart(2,'0')}`;
+  };
+  const dayLabel = k => {
+    const [y,m,d] = k.split('-').map(Number);
+    return new Date(y, m-1, d).toLocaleDateString('ru-RU', { day:'numeric', month:'long', year:'numeric' });
+  };
+  const cardHTML = e => {
     const body = [
       !isAnonymized ? `<div class="name">${esc(e.student_name)}</div>` : '',
       !isAnonymized && e.group_name ? `<div><span class="group">${esc(e.group_name)}</span></div>` : '',
@@ -257,7 +265,18 @@ function renderShare(data, password) {
       ${showEntryDate ? `<div class="foot">${new Date(e.created_at).toLocaleString('ru',{day:'2-digit',month:'2-digit',year:'numeric',hour:'2-digit',minute:'2-digit'})}</div>` : ''}
     </div>
   `;
-  }).join('');
+  };
+  const groups = [];
+  let lastKey = null;
+  data.entries.forEach(e => {
+    const k = dayKey(e);
+    if (k !== lastKey) { groups.push({ key: k, entries: [] }); lastKey = k; }
+    groups[groups.length-1].entries.push(e);
+  });
+  grid.innerHTML = groups.map(g =>
+    `<div class="date-sep"><span class="date-chip">${esc(dayLabel(g.key))}</span><span class="date-line"></span></div>` +
+    g.entries.map(cardHTML).join('')
+  ).join('');
 }
 
 document.getElementById('lightbox').addEventListener('click', () => document.getElementById('lightbox').classList.remove('open'));