Optimize frontend rendering: delta updates, rAF debouncing, cached DOM refs

- Disable Chart.js animations on real-time FPS and perf charts
- Dashboard: delta-update profile badges on state changes instead of full DOM rebuild
- Dashboard: cache querySelector results in Map for metrics update loop
- Dashboard: debounce poll interval slider restart (300ms)
- Calibration: debounce ResizeObserver and span drag via requestAnimationFrame
- Calibration: batch updateCalibrationPreview canvas render into rAF

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

server/src/wled_controller/static/js/features/perf-charts.js

@@ -77,7 +77,7 @@ function _createChart(canvasId, color, fillColor) {
         options: {
             responsive: true,
             maintainAspectRatio: false,
-            animation: true,
+            animation: false,
             plugins: { legend: { display: false }, tooltip: { enabled: false } },
             scales: {
                 x: { display: false },