Add documentation

frontend/src/utils/utils.ts

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+/**
+ * @fileoverview Utility functions used throughout the application
+ * @description Contains helper functions for common operations
+ * @author Cursor
+ * @version 1.0.0
+ */
+
+/**
+ * Formats a timestamp string to HH:MM format
+ * @param {string} dateString - ISO timestamp string to format
+ * @returns {string} Formatted time string in HH:MM format
+ * @example
+ * formatTime('2024-01-15T14:30:00Z'); // Returns "14:30"
+ */
+export function formatTime(dateString: string): string {
+    const date = new Date(dateString);
+    let hours = date.getHours();
+    let minutes = date.getMinutes();
+    const hoursString = hours < 10 ? '0' + hours : hours;
+    const minutesString = minutes < 10 ? '0' + minutes : minutes;
+    return hoursString + ':' + minutesString;
+}
+
+/**
+ * Creates a promise that resolves after a specified delay
+ * @param {number} ms - Delay time in milliseconds
+ * @returns {Promise<void>} Promise that resolves after the delay
+ * @example
+ * await delay(1000); // Wait for 1 second
+ */
+export function delay(ms: number): Promise<void> {
+    return new Promise(resolve => setTimeout(resolve, ms));
+}