fix: normalize Unicode in local user search for special characters

Apply NFKD normalization to both indexed text and search queries so
that stylized Unicode characters (e.g. 𝚋𝚊𝚝𝚜𝚒𝚚) are decomposed to
their ASCII equivalents and can be matched by search.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/services/client.service.ts

@@ -1040,7 +1040,7 @@ class ClientService extends EventTarget {
   /** =========== Profile =========== */
 
   async searchNpubsFromLocal(query: string, limit: number = 100) {
-    const result = await this.userIndex.searchAsync(query, { limit })
+    const result = await this.userIndex.searchAsync(query.normalize('NFKD'), { limit })
     return result.map((pubkey) => pubkeyToNpub(pubkey as string)).filter(Boolean) as string[]
   }
 
@@ -1060,7 +1060,9 @@ class ClientService extends EventTarget {
           ?.split('@')
           .map((s: string) => s.trim())
           .join(' ') ?? ''
-      ].join(' ')
+      ]
+        .join(' ')
+        .normalize('NFKD')
       if (!text) return
 
       await this.userIndex.addAsync(profileEvent.pubkey, text)