Aggiunge annunci in-app/sito, contatti e migliora UI copertina sul portale.

Include admin/API/banner nativi, form contatti e reset copertina standard con layout edit più ampio.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/config/locales/app.en.yml

@@ -16,6 +16,8 @@ en:
               too_short: "is too short (minimum is %{count} characters)"
               too_long: "is too long (maximum is %{count} characters)"
               complexity: "must include at least 3 of: lowercase letters, uppercase letters, numbers and symbols"
+        app_announcement:
+          no_channel: Select at least one destination (apps, public website or logged-in area).
   club:
     back_to_club: "← Club"
     sport_label: Main sport
@@ -39,6 +41,8 @@ en:
       cover_file_label: Cover image
       cover_preview_alt: Live cover preview
       cover_remove_label: Remove custom cover
+      cover_reset_button: Restore standard cover
+      cover_reset_pending_hint: The standard cover will be restored when you save.
       cover_requires_full: Custom sponsor covers are available on the Premium Full plan.
       cover_see_plans: See plans
     dashboard: