feat: festival/event model frontend + topbar activeren

- Events lijst: card grid met festival/serie chips
- Festival detail: programmaonderdelen grid
- CreateSubEventDialog voor sub-events binnen festival
- EventTabsNav: breadcrumb terug naar festival
- Sessie A: festival-bewuste EventResource + children endpoint
- Topbar: zoekbalk, theme switcher, shortcuts, notificaties
- Schema v1.7 + BACKLOG.md toegevoegd
- 121 tests groen

apps/app/src/layouts/components/DefaultLayoutWithHorizontalNav.vue

@@ -7,7 +7,6 @@ import { themeConfig } from '@themeConfig'
 import Footer from '@/layouts/components/Footer.vue'
 import NavbarThemeSwitcher from '@/layouts/components/NavbarThemeSwitcher.vue'
 import UserProfile from '@/layouts/components/UserProfile.vue'
-import NavBarI18n from '@core/components/I18n.vue'
 import { HorizontalNavLayout } from '@layouts'
 import { VNodeRenderer } from '@layouts/components/VNodeRenderer'
 </script>
@@ -28,11 +27,6 @@ import { VNodeRenderer } from '@layouts/components/VNodeRenderer'
       </RouterLink>
       <VSpacer />
 
-      <NavBarI18n
-        v-if="themeConfig.app.i18n.enable && themeConfig.app.i18n.langConfig?.length"
-        :languages="themeConfig.app.i18n.langConfig"
-      />
-
       <NavbarThemeSwitcher class="me-2" />
       <UserProfile />
     </template>