feat: Add unknown delivery status indicator + update docs

Add clickable "?" icon on DMs without ACK, showing a popup
explaining that delivery is unknown (mobile-friendly).
Update README, user guide with new features (Analyzer links,
DM delivery tracking).

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

README.md

@@ -23,6 +23,8 @@ A lightweight web interface for meshcore-cli, providing browser-based access to
 - **Interactive Console** - Direct meshcli command execution via WebSocket
 - **@Mentions autocomplete** - Type @ to see contact suggestions with fuzzy search
 - **Echo tracking** - "Heard X repeats" with repeater IDs for sent messages, route path for incoming messages (persisted across restarts)
+- **MeshCore Analyzer** - View packet details on analyzer.letsmesh.net directly from channel messages
+- **DM delivery tracking** - ACK-based delivery confirmation with SNR and route info
 - **PWA support** - Browser notifications and installable app (experimental)
 - **Full offline support** - Works without internet (local Bootstrap, icons, emoji picker)
 
@@ -308,6 +310,8 @@ sudo ~/mc-webui/scripts/updater/install.sh --uninstall
 - [x] Interactive Console - Direct meshcli access via WebSocket with command history
 - [x] Contact Map - View contacts with GPS coordinates on OpenStreetMap (Leaflet)
 - [x] Echo Tracking - "Heard X repeats" badge for sent channel messages
+- [x] MeshCore Analyzer - Packet analysis links on channel messages (analyzer.letsmesh.net)
+- [x] DM Delivery Tracking - ACK-based delivery checkmarks with SNR/route details
 
 ### Next Steps
 

app/static/css/style.css

@@ -536,6 +536,30 @@ main {
     color: #dc3545;
 }
 
+.dm-status.unknown {
+    color: #adb5bd;
+}
+
+.dm-status-unknown {
+    cursor: pointer;
+    position: relative;
+}
+
+.dm-delivery-popup {
+    position: absolute;
+    bottom: 100%;
+    right: 0;
+    background-color: #333;
+    color: #fff;
+    padding: 0.35rem 0.6rem;
+    border-radius: 0.375rem;
+    font-size: 0.7rem;
+    white-space: nowrap;
+    z-index: 1000;
+    pointer-events: none;
+    margin-bottom: 0.25rem;
+}
+
 /* DM Action Buttons */
 .dm-actions {
     display: flex;

app/static/js/dm.js

@@ -424,7 +424,7 @@ function displayMessages(messages) {
 
         // Status icon for own messages
         let statusIcon = '';
-        if (msg.is_own && msg.status) {
+        if (msg.is_own) {
             if (msg.status === 'delivered') {
                 let title = 'Delivered';
                 if (msg.delivery_snr !== null && msg.delivery_snr !== undefined) {
@@ -432,12 +432,11 @@ function displayMessages(messages) {
                 }
                 if (msg.delivery_route) title += ` (${msg.delivery_route})`;
                 statusIcon = `<i class="bi bi-check2 dm-status delivered" title="${title}"></i>`;
+            } else if (msg.status === 'pending') {
+                statusIcon = '<i class="bi bi-clock dm-status pending" title="Sending..."></i>';
             } else {
-                const icons = {
-                    'pending': '<i class="bi bi-clock dm-status pending" title="Sending..."></i>',
-                    'timeout': '<i class="bi bi-x-circle dm-status timeout" title="Not delivered"></i>'
-                };
-                statusIcon = icons[msg.status] || '';
+                // No ACK received — show clickable "?" with explanation
+                statusIcon = `<span class="dm-status-unknown" onclick="showDeliveryInfo(this)"><i class="bi bi-question-circle dm-status unknown"></i></span>`;
             }
         }
 
@@ -630,6 +629,29 @@ function resendMessage(content) {
     input.focus();
 }
 
+/**
+ * Show delivery info popup (mobile-friendly, same pattern as showPathPopup)
+ */
+function showDeliveryInfo(element) {
+    const existing = document.querySelector('.dm-delivery-popup');
+    if (existing) existing.remove();
+
+    const popup = document.createElement('div');
+    popup.className = 'dm-delivery-popup';
+    popup.textContent = 'Delivery unknown \u2014 no ACK received. Message may still have been delivered.';
+    element.style.position = 'relative';
+    element.appendChild(popup);
+
+    const dismiss = () => popup.remove();
+    setTimeout(dismiss, 5000);
+    document.addEventListener('click', function handler(e) {
+        if (!element.contains(e.target)) {
+            dismiss();
+            document.removeEventListener('click', handler);
+        }
+    });
+}
+
 /**
  * Setup emoji picker
  */

docs/user-guide.md

@@ -166,8 +166,9 @@ Access the Direct Messages feature:
 
 ### Message Status Indicators
 
+- ✓ **Delivered** (green checkmark) - Recipient confirmed receipt (ACK). Tap/hover for SNR and route details
+- ? **Unknown** (gray question mark) - No ACK received. Message may still have been delivered — ACK packets are often lost over multi-hop routes. Tap the icon for details
 - ⏳ **Pending** (clock icon, yellow) - Message sent, awaiting delivery confirmation
-- Note: Due to meshcore-cli limitations, we cannot track actual delivery status
 
 ### DM Notifications