Add Spanish (Latin American) activities translations

Full activities i18n for Spanish: categories, detail page, tickets,
filters. Uses Latin American terminology (boleto instead of entrada,
charla instead of ponencia). Added Spanish to the standalone app
Settings language picker alongside French and English.

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

src/activities-app/views/SettingsPage.vue

@@ -11,6 +11,12 @@ import { Sun, Moon, LogIn, LogOut } from 'lucide-vue-next'
 const { theme, setTheme } = useTheme()
 const { locale } = useI18n()
 
+const languages: { code: AvailableLocale; label: string }[] = [
+  { code: 'fr', label: 'Français' },
+  { code: 'en', label: 'English' },
+  { code: 'es', label: 'Español' },
+]
+
 const isAuthenticated = computed(() => auth.isAuthenticated.value)
 const userPubkey = computed(() => auth.currentUser.value?.pubkey)
 
@@ -75,13 +81,13 @@ async function handleLogout() {
       <h2 class="text-sm font-medium text-muted-foreground uppercase tracking-wide">Language</h2>
       <div class="flex gap-2">
         <Button
-          v-for="lang in (['fr', 'en'] as const)"
-          :key="lang"
-          :variant="locale === lang ? 'default' : 'outline'"
+          v-for="lang in languages"
+          :key="lang.code"
+          :variant="locale === lang.code ? 'default' : 'outline'"
           size="sm"
-          @click="setLanguage(lang)"
+          @click="setLanguage(lang.code)"
         >
-          {{ lang === 'fr' ? 'Français' : 'English' }}
+          {{ lang.label }}
         </Button>
       </div>
     </div>

src/i18n/locales/es.ts

@@ -30,6 +30,67 @@ const messages: LocaleMessages = {
     de: 'Alemán',
     zh: 'Chino'
   },
+  activities: {
+    title: 'Actividades',
+    createNew: 'Crear actividad',
+    noActivities: 'No se encontraron actividades',
+    filters: {
+      all: 'Todas',
+      today: 'Hoy',
+      tomorrow: 'Mañana',
+      thisWeek: 'Esta semana',
+      thisMonth: 'Este mes',
+    },
+    categories: {
+      concert: 'Concierto',
+      workshop: 'Taller',
+      market: 'Mercado',
+      festival: 'Festival',
+      exhibition: 'Exposición',
+      sport: 'Deporte',
+      theater: 'Teatro',
+      cinema: 'Cine',
+      party: 'Fiesta',
+      talk: 'Charla',
+      conference: 'Conferencia',
+      meetup: 'Encuentro',
+      food: 'Gastronomía',
+      outdoor: 'Al aire libre',
+      kids: 'Niños',
+      wellness: 'Bienestar',
+      technology: 'Tecnología',
+      art: 'Arte',
+      music: 'Música',
+      dance: 'Danza',
+      literature: 'Literatura',
+      comedy: 'Comedia',
+      charity: 'Solidario',
+      tradition: 'Tradición',
+      other: 'Otro',
+    },
+    detail: {
+      getTicket: 'Obtener boleto',
+      going: 'Voy',
+      maybe: 'Tal vez',
+      notGoing: 'No voy',
+      contactOrganizer: 'Contactar organizador',
+      organizer: 'Organizador',
+      location: 'Ubicación',
+      when: 'Cuándo',
+      tickets: 'Boletos',
+      ticketsAvailable: '{count} boletos disponibles',
+      soldOut: 'Agotado',
+      free: 'Gratis',
+    },
+    tickets: {
+      myTickets: 'Mis boletos',
+      scanTicket: 'Escanear boleto',
+      noTickets: 'Aún no tienes boletos',
+      paid: 'Pagado',
+      pending: 'Pendiente',
+      registered: 'Registrado',
+    },
+  },
   dateTimeFormats: {
     short: {
       year: 'numeric',