Add settings page for managing forecasting API key and URL via UI

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

frontend/node_modules/recharts/es6/util/getRadiusAndStrokeWidthFromDot.js

@@ -0,0 +1,26 @@
+import { svgPropertiesNoEventsFromUnknown } from './svgPropertiesNoEvents';
+export function getRadiusAndStrokeWidthFromDot(dot) {
+  var props = svgPropertiesNoEventsFromUnknown(dot);
+  var defaultR = 3;
+  var defaultStrokeWidth = 2;
+  if (props != null) {
+    var r = props.r,
+      strokeWidth = props.strokeWidth;
+    var realR = Number(r);
+    var realStrokeWidth = Number(strokeWidth);
+    if (Number.isNaN(realR) || realR < 0) {
+      realR = defaultR;
+    }
+    if (Number.isNaN(realStrokeWidth) || realStrokeWidth < 0) {
+      realStrokeWidth = defaultStrokeWidth;
+    }
+    return {
+      r: realR,
+      strokeWidth: realStrokeWidth
+    };
+  }
+  return {
+    r: defaultR,
+    strokeWidth: defaultStrokeWidth
+  };
+}