Implement search functionality - Add searchItems server action with list-scoped and global search - Add highlightText utility function for search result highlighting - Search across title, description, notes, and tags fields - Requirements: 8.1, 8.2, 8.5

lib/utils.ts

@@ -0,0 +1,23 @@
+/**
+ * Highlights matching text in a string by wrapping matches with a marker
+ * @param text - The text to search in
+ * @param query - The search query to highlight
+ * @returns The text with highlighted matches wrapped in <mark> tags
+ */
+export function highlightText(text: string, query: string): string {
+  if (!query.trim() || !text) {
+    return text
+  }
+
+  const regex = new RegExp(`(${escapeRegExp(query)})`, 'gi')
+  return text.replace(regex, '<mark>$1</mark>')
+}
+
+/**
+ * Escapes special regex characters in a string
+ * @param string - The string to escape
+ * @returns The escaped string safe for use in RegExp
+ */
+function escapeRegExp(string: string): string {
+  return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
+}