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/es-toolkit/dist/array/differenceWith.mjs

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+//#region src/array/differenceWith.ts
+/**
+* Computes the difference between two arrays based on a custom equality function.
+*
+* This function takes two arrays and a custom comparison function. It returns a new array containing
+* the elements that are present in the first array but not in the second array. The comparison to determine
+* if elements are equal is made using the provided custom function.
+*
+* @template T, U
+* @param firstArr - The array from which to get the difference.
+* @param secondArr - The array containing elements to exclude from the first array.
+* @param areItemsEqual - A function to determine if two items are equal.
+* @returns A new array containing the elements from the first array that do not match any elements in the second array
+* according to the custom equality function.
+*
+* @example
+* const array1 = [{ id: 1 }, { id: 2 }, { id: 3 }];
+* const array2 = [{ id: 2 }, { id: 4 }];
+* const areItemsEqual = (a, b) => a.id === b.id;
+* const result = differenceWith(array1, array2, areItemsEqual);
+* // result will be [{ id: 1 }, { id: 3 }] since the elements with id 2 are considered equal and are excluded from the result.
+*
+* @example
+* const array1 = [{ id: 1 }, { id: 2 }, { id: 3 }];
+* const array2 = [2, 4];
+* const areItemsEqual = (a, b) => a.id === b;
+* const result = differenceWith(array1, array2, areItemsEqual);
+* // result will be [{ id: 1 }, { id: 3 }] since the element with id 2 is considered equal to the second array's element and is excluded from the result.
+*/
+function differenceWith(firstArr, secondArr, areItemsEqual) {
+	return firstArr.filter((firstItem) => {
+		return secondArr.every((secondItem) => {
+			return !areItemsEqual(firstItem, secondItem);
+		});
+	});
+}
+//#endregion
+export { differenceWith };