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.js

@@ -0,0 +1,42 @@
+//#region src/array/chunkBy.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']]
+*/
+function chunkBy(arr, iteratee) {
+	const result = [];
+	let prevKey;
+	for (let i = 0; i < arr.length; i++) {
+		const key = iteratee(arr[i]);
+		if (i === 0 || key !== prevKey) result.push([arr[i]]);
+		else result[result.length - 1].push(arr[i]);
+		prevKey = key;
+	}
+	return result;
+}
+//#endregion
+exports.chunkBy = chunkBy;