fix: include slug helpers

src/lib/slug.ts

@@ -0,0 +1,17 @@
+export function slugify(value: string): string {
+  const ascii = value
+    .normalize("NFD")
+    .replace(/[\u0300-\u036f]/g, "")
+    .replace(/[\u2013\u2014]/g, "-")
+  const sanitized = ascii.replace(/[^a-zA-Z0-9\s-]/g, "")
+  const hyphenized = sanitized.replace(/[_\s]+/g, "-").replace(/-+/g, "-")
+  return hyphenized.replace(/^-+|-+$/g, "").toLowerCase()
+}
+
+export function normalizeSlug(input?: string | null): string | undefined {
+  if (!input) return undefined
+  const trimmed = input.trim()
+  if (!trimmed) return undefined
+  const slug = slugify(trimmed)
+  return slug || undefined
+}