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/round.js

@@ -0,0 +1,32 @@
+// if you go lower than 3, wild wild things happen during rendering
+var defaultRoundPrecision = 4;
+export function round(num) {
+  var roundPrecision = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : defaultRoundPrecision;
+  var factor = 10 ** roundPrecision;
+  var rounded = Math.round(num * factor) / factor;
+  if (Object.is(rounded, -0)) {
+    return 0;
+  }
+  return rounded;
+}
+
+/**
+ * This function will accept a string template literal and for each
+ * variable placeholder, it will round the value to avoid long float numbers in
+ * the SVG path which might cause rendering issues in some browsers.
+ */
+export function roundTemplateLiteral(strings) {
+  for (var _len = arguments.length, values = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+    values[_key - 1] = arguments[_key];
+  }
+  return strings.reduce((result, string, i) => {
+    var value = values[i - 1];
+    if (typeof value === 'string') {
+      return result + value + string;
+    }
+    if (value !== undefined) {
+      return result + round(value) + string;
+    }
+    return result + string;
+  }, '');
+}