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/CartesianUtils.js

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+export var rectWithPoints = (_ref, _ref2) => {
+  var x1 = _ref.x,
+    y1 = _ref.y;
+  var x2 = _ref2.x,
+    y2 = _ref2.y;
+  return {
+    x: Math.min(x1, x2),
+    y: Math.min(y1, y2),
+    width: Math.abs(x2 - x1),
+    height: Math.abs(y2 - y1)
+  };
+};
+
+/**
+ * Compute the x, y, width, and height of a box from two reference points.
+ * @param  {Object} coords     x1, x2, y1, and y2
+ * @return {Object} object
+ */
+export var rectWithCoords = _ref3 => {
+  var x1 = _ref3.x1,
+    y1 = _ref3.y1,
+    x2 = _ref3.x2,
+    y2 = _ref3.y2;
+  return rectWithPoints({
+    x: x1,
+    y: y1
+  }, {
+    x: x2,
+    y: y2
+  });
+};
+
+/** Normalizes the angle so that 0 <= angle < 180.
+ * @param {number} angle Angle in degrees.
+ * @return {number} the normalized angle with a value of at least 0 and never greater or equal to 180. */
+export function normalizeAngle(angle) {
+  return (angle % 180 + 180) % 180;
+}
+
+/** Calculates the width of the largest horizontal line that fits inside a rectangle that is displayed at an angle.
+ * @param {Object} size Width and height of the text in a horizontal position.
+ * @param {number} angle Angle in degrees in which the text is displayed.
+ * @return {number} The width of the largest horizontal line that fits inside a rectangle that is displayed at an angle.
+ */
+export var getAngledRectangleWidth = function getAngledRectangleWidth(_ref4) {
+  var width = _ref4.width,
+    height = _ref4.height;
+  var angle = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
+  // Ensure angle is >= 0 && < 180
+  var normalizedAngle = normalizeAngle(angle);
+  var angleRadians = normalizedAngle * Math.PI / 180;
+
+  /* Depending on the height and width of the rectangle, we may need to use different formulas to calculate the angled
+   * width. This threshold defines when each formula should kick in. */
+  var angleThreshold = Math.atan(height / width);
+  var angledWidth = angleRadians > angleThreshold && angleRadians < Math.PI - angleThreshold ? height / Math.sin(angleRadians) : width / Math.cos(angleRadians);
+  return Math.abs(angledWidth);
+};