feat(chat): separadores de fecha estilo WhatsApp

Muestra "Hoy", "Ayer" o la fecha entre grupos de mensajes de días distintos.
El timestamp del bubble ahora solo muestra la hora.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

modules/turnero/views/chat.php

@@ -152,6 +152,11 @@ html, body { height: 100%; overflow: hidden; font-family: -apple-system, BlinkMa
 .msg-time {
     font-size: .68rem; color: #aaa; text-align: right; margin-top: 3px;
 }
+.date-sep {
+    align-self: center; background: #e9ecef; color: #6c757d;
+    font-size: .73rem; font-weight: 600; padding: 3px 12px;
+    border-radius: 99px; margin: 10px 0; user-select: none;
+}
 .msg-type-badge {
     font-size: .7rem; color: #888; font-style: italic;
 }
@@ -743,6 +748,8 @@ async function pollMessages() {
 }
 
 // ── Render mensajes ───────────────────────────────────────────────────────────
+let _lastRenderedDay = null;
+
 function renderMessages(msgs, prepend) {
     const area = document.getElementById('messagesArea');
     area.innerHTML = '';
@@ -755,7 +762,16 @@ function renderMessages(msgs, prepend) {
     loadBtn.innerHTML  = '<i class="fas fa-chevron-up"></i> Ver mensajes anteriores';
     area.appendChild(loadBtn);
 
-    msgs.forEach(m => area.appendChild(buildBubble(m)));
+    let lastDay = null;
+    msgs.forEach(m => {
+        const day = m.created_at ? msgDay(m.created_at) : null;
+        if (day && day !== lastDay) {
+            area.appendChild(buildDateSep(dateLabel(m.created_at)));
+            lastDay = day;
+        }
+        area.appendChild(buildBubble(m));
+    });
+    _lastRenderedDay = lastDay;
     area.scrollTop = area.scrollHeight;
 }
 
@@ -763,15 +779,39 @@ function prependMessages(msgs) {
     const area    = document.getElementById('messagesArea');
     const oldTop  = area.scrollHeight - area.scrollTop;
     const loadBtn = document.getElementById('loadMoreBtn');
-    msgs.forEach(m => area.insertBefore(buildBubble(m), loadBtn.nextSibling));
+    // Día del primer mensaje que ya estaba en pantalla (para no duplicar separador)
+    const firstBubble = loadBtn.nextSibling;
+    const firstExistingDay = firstBubble?.dataset?.msgId
+        ? msgDay(msgs[msgs.length - 1]?.created_at || '')  // comparar con el último del lote nuevo
+        : null;
+    let lastDay = null;
+    let insertRef = loadBtn.nextSibling;
+    msgs.forEach(m => {
+        const day = m.created_at ? msgDay(m.created_at) : null;
+        if (day && day !== lastDay) {
+            area.insertBefore(buildDateSep(dateLabel(m.created_at)), insertRef);
+            lastDay = day;
+        }
+        area.insertBefore(buildBubble(m), insertRef);
+        insertRef = area.querySelector(`[data-msg-id="${m.id}"]`)?.nextSibling || insertRef;
+    });
+    // Eliminar separador duplicado si el último día del lote coincide con el primero ya visible
+    const seps = area.querySelectorAll('.date-sep');
+    for (let i = 0; i < seps.length - 1; i++) {
+        if (seps[i].textContent === seps[i+1].textContent) seps[i+1].remove();
+    }
     if (!state.hasMore) loadBtn.style.display = 'none';
     area.scrollTop = area.scrollHeight - oldTop;
 }
 
 function appendMessage(msg) {
-    const area   = document.getElementById('messagesArea');
-    const bubble = buildBubble(msg);
-    area.appendChild(bubble);
+    const area = document.getElementById('messagesArea');
+    const day  = msg.created_at ? msgDay(msg.created_at) : null;
+    if (day && day !== _lastRenderedDay) {
+        area.appendChild(buildDateSep(dateLabel(msg.created_at)));
+        _lastRenderedDay = day;
+    }
+    area.appendChild(buildBubble(msg));
     area.scrollTop = area.scrollHeight;
 }
 
@@ -1415,6 +1455,22 @@ function escHtml(str) {
     return String(str ?? '').replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;');
 }
 function nl2br(str) { return str.replace(/\n/g, '<br>'); }
+function dateLabel(ts) {
+    const d = new Date(ts.replace(' ', 'T'));
+    const now = new Date();
+    const yesterday = new Date(now); yesterday.setDate(now.getDate() - 1);
+    if (d.toDateString() === now.toDateString()) return 'Hoy';
+    if (d.toDateString() === yesterday.toDateString()) return 'Ayer';
+    return d.toLocaleDateString('es-CO', { weekday:'short', day:'2-digit', month:'short' });
+}
+function buildDateSep(label) {
+    const el = document.createElement('div');
+    el.className = 'date-sep';
+    el.textContent = label;
+    return el;
+}
+function msgDay(ts) { return new Date(ts.replace(' ', 'T')).toDateString(); }
+
 function formatTime(ts) {
     const d = new Date(ts.replace(' ', 'T'));
     const now = new Date();
@@ -1425,9 +1481,7 @@ function formatTime(ts) {
 }
 function formatTimeFull(ts) {
     const d = new Date(ts.replace(' ', 'T'));
-    const t = d.toLocaleTimeString('es-CO', { hour: '2-digit', minute: '2-digit' });
-    if (d.toDateString() === new Date().toDateString()) return t;
-    return d.toLocaleDateString('es-CO', { day: '2-digit', month: '2-digit' }) + ' ' + t;
+    return d.toLocaleTimeString('es-CO', { hour: '2-digit', minute: '2-digit' });
 }
 </script>
 </body>