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/chunkBy.d.mts

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+//#region src/array/chunkBy.d.ts
+/**
+ * Splits an array into chunks of consecutive elements that share the same key.
+ *
+ * Walking left to right, each element's key is derived by `iteratee`. Whenever
+ * the key differs from the previous element's key, a new chunk is started;
+ * otherwise the element is appended to the current chunk. Keys are compared with
+ * `!==` (strict inequality), so equal primitives stay together while distinct
+ * object references always start a new chunk.
+ *
+ * Unlike {@link chunk}, which splits by a fixed size, `chunkBy` splits by a
+ * boundary condition, keeping runs of same-keyed elements together.
+ *
+ * @template T - The type of elements in the array.
+ * @param arr - The array to split into chunks.
+ * @param iteratee - A function that derives the comparison key for each element.
+ * @returns A two-dimensional array where each sub-array is a run of consecutive
+ *   elements that produced the same key.
+ *
+ * @example
+ * // Group consecutive equal numbers
+ * chunkBy([1, 1, 2, 3, 3, 3], value => value);
+ * // Returns: [[1, 1], [2], [3, 3, 3]]
+ *
+ * @example
+ * // Group consecutive words by their length
+ * chunkBy(['a', 'b', 'cd', 'ef', 'g'], word => word.length);
+ * // Returns: [['a', 'b'], ['cd', 'ef'], ['g']]
+ */
+declare function chunkBy<T>(arr: readonly T[], iteratee: (value: T) => unknown): T[][];
+//#endregion
+export { chunkBy };