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/string/padStart.d.ts

@@ -0,0 +1,21 @@
+//#region src/compat/string/padStart.d.ts
+/**
+ * Pads the start of a string with a given character until it reaches the specified length.
+ *
+ * If the length is less than or equal to the original string's length, or if the padding character is an empty string,
+ * the original string is returned unchanged.
+ *
+ * @param str - The string to pad.
+ * @param [length] - The length of the resulting string once padded.
+ * @param [chars] - The character(s) to use for padding.
+ * @returns The padded string, or the original string if padding is not required.
+ *
+ * @example
+ * const result1 = padStart('abc', 6);          // result will be '   abc'
+ * const result2 = padStart('abc', 6, '_-');    // result will be '_-_abc'
+ * const result3 = padStart('abc', 3);          // result will be 'abc'
+ * const result4 = padStart('abc', 2);          // result will be 'abc'
+ */
+declare function padStart(str?: string, length?: number, chars?: string): string;
+//#endregion
+export { padStart };