feat: make live data status actionable (Closes #745)

frontend/index.html

@@ -12,7 +12,7 @@
 <canvas id="bg"></canvas>
 <header>
   <div class="app-brand"><span class="obi"></span><strong>Stackchain</strong><span class="muted">Dashboard</span></div>
-  <div class="app-live-status"><span class="dot"></span><span class="small" id="status">Live</span></div>
+  <button class="app-live-status" id="open-live-data-status" type="button" aria-controls="live-data-status-sheet" aria-expanded="false"><span class="dot"></span><span class="small" id="status">Live</span></button>
   <details class="app-menu">
     <summary id="app-menu-toggle" aria-label="Open dashboard menu">Menu</summary>
     <div class="app-menu-panel">
@@ -26,6 +26,20 @@
     </div>
   </details>
 </header>
+<div id="live-data-status-sheet" class="live-data-status-sheet" hidden>
+  <section class="live-data-status-panel" role="dialog" aria-modal="true" aria-labelledby="live-data-status-heading">
+    <div class="live-data-status-header">
+      <div><h2 id="live-data-status-heading">Live data status</h2><p class="small muted">Check which dashboard feeds are current before acting.</p></div>
+      <button id="close-live-data-status" type="button" aria-label="Close live data status">Close</button>
+    </div>
+    <div id="live-data-status-feeds" class="live-data-status-feeds"></div>
+    <p id="live-data-status-retry" class="small muted"></p>
+    <div class="live-data-status-actions">
+      <button id="refresh-live-data" type="button">Refresh now</button>
+      <span id="live-data-status-result" class="small" role="status" aria-live="polite"></span>
+    </div>
+  </section>
+</div>
 <div class="offline-status" id="offline-status" role="status" aria-live="polite" hidden>
   Offline · live Gitea data is unavailable. Saved drafts remain available on this device.
 </div>
@@ -1053,6 +1067,7 @@
 <script src="static/work-route.js"></script>
 <script src="static/task-overlay-history.js"></script>
 <script src="static/context-poller.js"></script>
+<script src="static/live-data-status.js"></script>
 <script src="static/mobile-task-dock.js"></script>
 <script src="static/mobile-work-entry.js"></script>
 <script src="static/mobile-queue-launcher.js"></script>