Add ability to edit participant name and phone number

server/database.ts

@@ -339,6 +339,10 @@ export const participantOps = {
     db.prepare('DELETE FROM participants WHERE id = ?').run(id);
   },
   
+  update: (id: number, name: string, phone: string | null): void => {
+    db.prepare('UPDATE participants SET name = ?, phone = ? WHERE id = ?').run(name, phone, id);
+  },
+  
   isTokenAvailable: (token: string): boolean => {
     const result = db.prepare('SELECT id FROM participants WHERE token = ?').get(token);
     return !result;