fix(admin): single update path per poll — no competing D3 transitions

Removed separate setInterval for buf flush. Flush + redraw now happen
together inside poll() — one atomic step, one D3 transition(950ms).
Two independent 1 s timers were firing out of phase and interrupting
each other's transitions, causing flicker and apparent 2 s cadence.

Co-Authored-By: Mira Rehfeld <noreply@anthropic.com>

apix-admin/src/main/resources/META-INF/resources/admin.js

@@ -214,18 +214,6 @@
     return Math.min(Math.round(sum * (60000 / CHART_TICK)), rateLimit);
   }
 
-  // Redraw: historical buf + live bucket at right edge, with smooth transition
-  function redraw() {
-    var view = buf.slice(1).concat([liveRpm()]);
-    path.transition().duration(900).ease(d3.easeLinear).attr('d', areaFn(view));
-  }
-
-  // Every 1 s: snapshot the sliding-window rate into the history buffer
-  // Smaller buckets (1 s each, 72 s total) so the chart scrolls visibly every second
-  setInterval(function () {
-    buf.push(liveRpm()); buf.shift();
-  }, 1000);
-
   async function poll() {
     try {
       var r = await fetch('/sandbox/' + sid + '/poll');
@@ -240,7 +228,9 @@
         }
         var rpm = liveRpm();
         updateLabel(rpm);
-        redraw();
+        // Flush + redraw in one step — no separate timer, no competing transitions
+        buf.push(rpm); buf.shift();
+        path.transition().duration(950).ease(d3.easeLinear).attr('d', areaFn(buf));
       }
       lastTotal = total;
       currentInterval = (Date.now() - lastActivity > IDLE_AFTER_MS) ? IDLE_INTERVAL : FAST_INTERVAL;

apix-admin/src/main/resources/templates/DashboardResource/global.html

@@ -106,6 +106,6 @@ nav {
 <script>var __D = {statsJson.raw};</script>
 <script src="https://cdn.jsdelivr.net/npm/d3@7/dist/d3.min.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/topojson-client@3/dist/topojson-client.min.js"></script>
-<script src="/admin.js?v=11"></script>
+<script src="/admin.js?v=12"></script>
 </body>
 </html>

apix-admin/src/main/resources/templates/DashboardResource/sandbox.html

@@ -151,6 +151,6 @@ button.promote:hover { background: #2ea043; }
 <script>var __D = {dataJson.raw};</script>
 <script src="https://cdn.jsdelivr.net/npm/d3@7/dist/d3.min.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/topojson-client@3/dist/topojson-client.min.js"></script>
-<script src="/admin.js?v=11"></script>
+<script src="/admin.js?v=12"></script>
 </body>
 </html>