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/util/invariant.js

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+//#region src/util/invariant.ts
+/**
+* Asserts that a given condition is true. If the condition is false, an error is thrown with the provided message.
+*
+* @param condition - The condition to evaluate.
+* @param [message] - The error message to throw if the condition is false.
+* @returns Returns void if the condition is true.
+* @throws {Error} Throws an error if the condition is false.
+*
+* @example
+* // This call will succeed without any errors
+* invariant(true, 'This should not throw');
+*
+* // This call will fail and throw an error with the message 'This should throw'
+* invariant(false, 'This should throw');
+*
+* // Example of using invariant with a condition
+* invariant(condition, 'Expected condition is false');
+*
+* // Ensure that the value is neither null nor undefined
+* invariant(value !== null && value !== undefined, 'Value should not be null or undefined');
+*
+* // Example of using invariant to check if a number is positive
+* invariant(number > 0, 'Number must be positive');
+*/
+function invariant(condition, message) {
+	if (condition) return;
+	if (typeof message === "string") throw new Error(message);
+	throw message;
+}
+//#endregion
+exports.invariant = invariant;