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/lib/util/scale/RechartsScale.js

@@ -0,0 +1,72 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.rechartsScaleFactory = rechartsScaleFactory;
+/**
+ * This is internal representation of scale used in Recharts.
+ * Users will provide CustomScaleDefinition or a string, which we will parse into RechartsScale.
+ * Most importantly, RechartsScale is fully immutable - there are no setters that mutate the scale in place.
+ * This is important for React integration - if the scale changes, we want to trigger re-renders.
+ * Mutating the scale in place would not trigger re-renders, leading to stale UI.
+ */
+
+/**
+ * Position within a band for banded scales.
+ * In scales that are not banded, this parameter is ignored.
+ *
+ * @inline
+ */
+
+function rechartsScaleFactory(d3Scale) {
+  if (d3Scale == null) {
+    return undefined;
+  }
+  var ticksFn = d3Scale.ticks;
+  var bandwidthFn = d3Scale.bandwidth;
+  var d3Range = d3Scale.range();
+  var range = [Math.min(...d3Range), Math.max(...d3Range)];
+  return {
+    domain: () => d3Scale.domain(),
+    range: function (_range) {
+      function range() {
+        return _range.apply(this, arguments);
+      }
+      range.toString = function () {
+        return _range.toString();
+      };
+      return range;
+    }(() => range),
+    rangeMin: () => range[0],
+    rangeMax: () => range[1],
+    isInRange(value) {
+      var first = range[0];
+      var last = range[1];
+      return first <= last ? value >= first && value <= last : value >= last && value <= first;
+    },
+    bandwidth: bandwidthFn ? () => bandwidthFn.call(d3Scale) : undefined,
+    ticks: ticksFn ? count => ticksFn.call(d3Scale, count) : undefined,
+    map: (input, options) => {
+      var baseValue = d3Scale(input);
+      if (baseValue == null) {
+        return undefined;
+      }
+      if (d3Scale.bandwidth && options !== null && options !== void 0 && options.position) {
+        var bandWidth = d3Scale.bandwidth();
+        switch (options.position) {
+          case 'middle':
+            baseValue += bandWidth / 2;
+            break;
+          case 'end':
+            baseValue += bandWidth;
+            break;
+          default:
+            // 'start' requires no adjustment
+            break;
+        }
+      }
+      return baseValue;
+    }
+  };
+}