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/compat/math/divide.d.ts

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+//#region src/compat/math/divide.d.ts
+/**
+ * Divide two numbers.
+ *
+ * If either of the numbers is `NaN`, the function returns `NaN`.
+ *
+ * @param value The first number in a division.
+ * @param other The second number in a division.
+ * @returns The quotient of value and other.
+ *
+ * @example
+ * divide(6, 3); // => 2
+ * divide(2, NaN); // => NaN
+ * divide(NaN, 3); // => NaN
+ * divide(NaN, NaN); // => NaN
+ */
+declare function divide(value: number, other: number): number;
+//#endregion
+export { divide };