refactor(tags): centralize tag slug logic in client-safe util

lib/posts.ts

@@ -2,6 +2,9 @@ import fs from 'fs'
 import path from 'path'
 import matter from 'gray-matter'
 import { cache } from 'react'
+import { tagToSlug } from '@/lib/tags'
+
+export { tagToSlug } from '@/lib/tags'
 
 const postsDirectory = path.join(process.cwd(), 'content/posts')
 
@@ -61,18 +64,6 @@ export const normalizePostData = (
   readingTime,
 })
 
-export const tagToSlug = (tag: string): string =>
-  tag
-    .normalize('NFKD')
-    .toLowerCase()
-    .replace(/[\u0300-\u036f]/g, '')
-    .replace(/\+/g, ' plus ')
-    .replace(/#/g, ' sharp ')
-    .replace(/[\\/]+/g, ' ')
-    .replace(/[^\p{L}\p{N}]+/gu, '-')
-    .replace(/-{2,}/g, '-')
-    .replace(/^-|-$/g, '')
-
 const getMdxFiles = cache(async () => {
   try {
     const files = await fs.promises.readdir(postsDirectory)