Fix identity subject extraction to handle punctuation in questions

src/App.tsx

@@ -347,7 +347,7 @@ function sanitizeSubject(value: string): string {
 }
 
 function extractIdentitySubject(normalizedQuery: string): string {
-  const match = normalizedQuery.match(/\b(?:who\s+(?:is|was)|tell me about)\s+([a-z][a-z\s'-]{1,40})$/i)
+  const match = normalizedQuery.match(/\b(?:who\s+(?:is|was)|tell me about)\s+([a-z][a-z\s'-]{1,40})\b/i)
   if (!match) return ''
   const cleaned = sanitizeSubject(match[1])
   const withoutArticles = cleaned.replace(/^(a|an|the)\s+/, '').trim()