feat: add waveform viewer endpoint and enhance UI with new tabs for history, units, monitor log, and sessions

sfm/waveform_viewer.html

@@ -183,7 +183,7 @@
   <h1>SFM Waveform Viewer</h1>
   <div class="conn-group">
     <label>API</label>
-    <input type="text" id="api-base" value="http://localhost:8200" style="width:180px" />
+    <input type="text" id="api-base" style="width:180px" />
   </div>
   <div class="conn-group">
     <label>Device host</label>
@@ -588,6 +588,9 @@
     }
   }
 
+  // Auto-detect API base from wherever this page was served from
+  document.getElementById('api-base').value = window.location.origin;
+
   // Allow Enter key on connection inputs to trigger connect
   ['api-base', 'dev-host', 'dev-tcp-port'].forEach(id => {
     document.getElementById(id).addEventListener('keydown', e => {