feat: improve add-task (#946)

* feat: improve add-task

* chore: format

src/constants/task-priority.js

@@ -0,0 +1,39 @@
+/**
+ * @typedef {'high' | 'medium' | 'low'} TaskPriority
+ */
+
+/**
+ * Task priority options
+ * @type {TaskPriority[]}
+ * @description Defines possible task priorities:
+ * - high: Critical tasks that need immediate attention
+ * - medium: Standard priority tasks (default)
+ * - low: Tasks that can be deferred or are nice-to-have
+ */
+export const TASK_PRIORITY_OPTIONS = ['high', 'medium', 'low'];
+
+/**
+ * Default task priority
+ * @type {TaskPriority}
+ */
+export const DEFAULT_TASK_PRIORITY = 'medium';
+
+/**
+ * Check if a given priority is valid
+ * @param {string} priority - The priority to check
+ * @returns {boolean} True if the priority is valid, false otherwise
+ */
+export function isValidTaskPriority(priority) {
+	return TASK_PRIORITY_OPTIONS.includes(priority?.toLowerCase());
+}
+
+/**
+ * Normalize a priority value to lowercase
+ * @param {string} priority - The priority to normalize
+ * @returns {TaskPriority|null} The normalized priority or null if invalid
+ */
+export function normalizeTaskPriority(priority) {
+	if (!priority) return null;
+	const normalized = priority.toLowerCase();
+	return isValidTaskPriority(normalized) ? normalized : null;
+}