Add floating day indicator (WhatsApp-style) + fix orphaned date dividers on per-channel clear

static/channels.js

@@ -308,9 +308,14 @@ function switchChannel(name) {
     const savedId = _channelScrollMsg[name];
     if (savedId) {
         const el = document.querySelector(`.message[data-id="${savedId}"]`);
-        if (el) { el.scrollIntoView({ block: 'start' }); return; }
+        if (el) {
+            el.scrollIntoView({ block: 'start' });
+            if (typeof dayFloatRefresh === 'function') dayFloatRefresh();
+            return;
+        }
     }
     window.scrollToBottom();
+    if (typeof dayFloatRefresh === 'function') dayFloatRefresh();
 }
 
 function filterMessagesByChannel() {

static/chat.js

@@ -577,7 +577,8 @@ function connectWebSocket() {
                 const container = document.getElementById('messages');
                 const toRemove = [];
                 for (const el of container.children) {
-                    if (el.dataset.id && (el.dataset.channel || 'general') === clearChannel) {
+                    const isDivider = el.classList.contains('date-divider');
+                    if ((el.dataset.id || isDivider) && (el.dataset.channel || 'general') === clearChannel) {
                         toRemove.push(el);
                     }
                 }
@@ -591,6 +592,7 @@ function connectWebSocket() {
                 lastMessageDate = null;
                 lastMessageDates = {};
             }
+            dayFloatRefresh();
             requestAnimationFrame(() => {
                 const _clearDbgAfter = _clearDbgList ? _clearDbgList.children.length : -1;
                 console.log('CLEAR_DEBUG after clear (next frame), jobs-panel-children=' + _clearDbgAfter);
@@ -666,6 +668,69 @@ function maybeInsertDateDivider(container, msg) {
     }
 }
 
+// --- Floating day indicator ---
+
+let dayFloatDividers = null;   // live HTMLCollection — follows divider add/remove
+let dayFloatFadeTimer = null;
+let dayFloatRafPending = false;
+
+function dayFloatLabel() {
+    if (!dayFloatDividers) {
+        const container = document.getElementById('messages');
+        if (!container) return null;
+        dayFloatDividers = container.getElementsByClassName('date-divider');
+    }
+    const scroll = document.getElementById('timeline');
+    if (!scroll) return null;
+    const top = scroll.getBoundingClientRect().top;
+    let label = null;
+    for (const d of dayFloatDividers) {
+        if (d.style.display === 'none') continue;
+        if (d.getBoundingClientRect().top <= top) {
+            label = d.textContent;
+        } else {
+            break;
+        }
+    }
+    return label;
+}
+
+function dayFloatHide() {
+    const float = document.getElementById('day-float');
+    if (!float) return;
+    if (dayFloatFadeTimer) { clearTimeout(dayFloatFadeTimer); dayFloatFadeTimer = null; }
+    float.classList.remove('visible');
+}
+
+function dayFloatOnScroll() {
+    if (dayFloatRafPending) return;
+    dayFloatRafPending = true;
+    requestAnimationFrame(() => {
+        dayFloatRafPending = false;
+        const float = document.getElementById('day-float');
+        if (!float) return;
+        const label = dayFloatLabel();
+        if (!label) { dayFloatHide(); return; }
+        float.querySelector('span').textContent = label;
+        float.classList.add('visible');
+        if (dayFloatFadeTimer) clearTimeout(dayFloatFadeTimer);
+        dayFloatFadeTimer = setTimeout(() => {
+            dayFloatFadeTimer = null;
+            float.classList.remove('visible');
+        }, 1200);
+    });
+}
+
+function dayFloatRefresh() {
+    // Recompute without starting the show/fade cycle: swap the label if the
+    // pill is relevant, hide (cancelling any fade) if no day is above the top.
+    const float = document.getElementById('day-float');
+    if (!float) return;
+    const label = dayFloatLabel();
+    if (!label) { dayFloatHide(); return; }
+    float.querySelector('span').textContent = label;
+}
+
 // --- Messages ---
 
 function appendMessage(msg) {
@@ -2499,6 +2564,7 @@ function setupScroll() {
             unreadCount = 0;
         }
         updateScrollAnchor();
+        dayFloatOnScroll();
     });
 
     // Keep pinned to bottom when content changes (e.g. images load)

static/index.html

@@ -4,7 +4,7 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>agentchattr</title>
-    <link rel="stylesheet" href="/static/style.css?v=249">
+    <link rel="stylesheet" href="/static/style.css?v=250">
     <link rel="stylesheet" href="/static/sessions.css?v=223">
     <link rel="stylesheet" href="/static/jobs.css?v=223">
     <link rel="icon" href="/static/favicon.ico">
@@ -172,6 +172,7 @@ <h1 id="room-title">agentchattr</h1>
                 <div class="channel-sidebar-grip" id="channel-sidebar-grip"></div>
             </aside>
             <main id="timeline">
+                <div id="day-float" aria-hidden="true"><span></span></div>
                 <div id="loading-indicator">
                     <div class="loading-spinner"></div>
                     <span>Loading messages...</span>
@@ -342,8 +343,8 @@ <h1 id="room-title">agentchattr</h1>
     <script src="/static/store.js?v=223"></script>
     <script src="/static/sessions.js?v=223"></script>
     <script src="/static/jobs.js?v=224"></script>
-    <script src="/static/channels.js?v=224"></script>
+    <script src="/static/channels.js?v=225"></script>
     <script src="/static/rules-panel.js?v=223"></script>
-    <script src="/static/chat.js?v=266"></script>
+    <script src="/static/chat.js?v=267"></script>
 </body>
 </html>

static/style.css

@@ -2553,6 +2553,38 @@ body.channels-in-sidebar #channel-bar {
     background: var(--border);
 }
 
+/* --- Floating day indicator --- */
+
+#day-float {
+    position: sticky;
+    top: 8px;
+    height: 0;
+    display: flex;
+    align-items: flex-start;
+    justify-content: center;
+    z-index: 6;
+    pointer-events: none;
+}
+
+#day-float span {
+    background: var(--bg-msg);
+    border: 1px solid var(--border);
+    border-radius: var(--radius-full);
+    padding: 3px 10px;
+    color: var(--text-dim);
+    font-size: 11px;
+    font-weight: 600;
+    text-transform: uppercase;
+    letter-spacing: 0.06em;
+    text-indent: 0.06em;
+    opacity: 0;
+    transition: opacity 0.25s ease;
+}
+
+#day-float.visible span {
+    opacity: 1;
+}
+
 /* --- Code copy button --- */
 
 .code-copy-btn {