Case-insensitive email lookup in Telegram auth

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Services/TelegramBotService.php

@@ -206,12 +206,14 @@ class TelegramBotService
 
     private function processEmail(string $chatId, string $email, string $nombre): void
     {
+        $email = strtolower(trim($email));
+
         if (! filter_var($email, FILTER_VALIDATE_EMAIL)) {
             $this->send($chatId, "❌ Eso no parece un correo válido. Escríbelo de nuevo:");
             return;
         }
 
-        $user = User::where('email', $email)->first();
+        $user = User::whereRaw('LOWER(email) = ?', [$email])->first();
 
         if (! $user) {
             $this->setState($chatId, [