feat(events): warn buyers to check their spam folder for the ticket email

A tester's ticket landed in spam. A mail-tester run of the demo mailer
scored 8.3/10 with authentication fully green, so the sender setup is
not at fault and the mailer is being hardened separately (aiolabs/events
fix/ticket-email-headers). Until sender reputation builds, tell buyers
where to look: a red hint under the email field.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EYwoAkZZmXMMmaBp4WGUBo

src/i18n/locales/en.ts

@@ -144,6 +144,7 @@ const messages: LocaleMessages = {
         nameRequired: 'Name is required',
         email: 'Email',
         emailHint: 'Your ticket will be sent to this address.',
+        spamHint: 'If it has not arrived a few minutes after paying, check your spam folder.',
         emailInvalid: 'Enter a valid email address',
         confirmEmail: 'Confirm email',
         emailMismatch: 'Email addresses do not match',

src/i18n/locales/es.ts

@@ -144,6 +144,7 @@ const messages: LocaleMessages = {
         nameRequired: 'El nombre es obligatorio',
         email: 'Correo electrónico',
         emailHint: 'Tu boleto se enviará a esta dirección.',
+        spamHint: 'Si no llega unos minutos después de pagar, revisa tu carpeta de spam.',
         emailInvalid: 'Introduce un correo electrónico válido',
         confirmEmail: 'Confirmar correo',
         emailMismatch: 'Los correos no coinciden',

src/i18n/locales/fr.ts

@@ -144,6 +144,7 @@ const messages: LocaleMessages = {
         nameRequired: 'Le nom est obligatoire',
         email: 'E-mail',
         emailHint: 'Votre billet sera envoyé à cette adresse.',
+        spamHint: 'S’il n’est pas arrivé quelques minutes après le paiement, vérifiez votre dossier spam.',
         emailInvalid: 'Saisissez une adresse e-mail valide',
         confirmEmail: "Confirmer l'e-mail",
         emailMismatch: 'Les adresses e-mail ne correspondent pas',

src/i18n/types.ts

@@ -119,6 +119,7 @@ export interface LocaleMessages {
         nameRequired: string
         email: string
         emailHint: string
+        spamHint: string
         emailInvalid: string
         confirmEmail: string
         emailMismatch: string

src/modules/events/components/PurchaseTicketDialog.vue

@@ -430,6 +430,7 @@ onUnmounted(() => {
                 <Input v-bind="componentField" type="email" inputmode="email" autocomplete="email" autocapitalize="none" spellcheck="false" placeholder="email@example.com" />
               </FormControl>
               <FormDescription class="text-xs">{{ t('events.purchase.contact.emailHint') }}</FormDescription>
+              <p class="text-xs font-medium text-destructive">{{ t('events.purchase.contact.spamHint') }}</p>
               <FormMessage />
             </FormItem>
           </FormField>