Add ability to email announcements to all users (#33928)

app/views/admin/announcements/_announcement.html.haml

@@ -10,6 +10,8 @@
         = l(announcement.created_at)
 
     %div
+      - if can?(:distribute, announcement)
+        = table_link_to 'mail', t('admin.terms_of_service.notify_users'), admin_announcement_preview_path(announcement)
       - if can?(:update, announcement)
         - if announcement.published?
           = table_link_to 'toggle_off', t('admin.announcements.unpublish'), unpublish_admin_announcement_path(announcement), method: :post, data: { confirm: t('admin.accounts.are_you_sure') }

app/views/admin/announcements/previews/show.html.haml

@@ -0,0 +1,20 @@
+- content_for :page_title do
+  = t('admin.announcements.preview.title')
+
+- content_for :heading_actions do
+  .back-link
+    = link_to admin_announcements_path do
+      = material_symbol 'chevron_left'
+      = t('admin.announcements.back')
+
+%p.lead
+  = t('admin.announcements.preview.explanation_html', count: @user_count, display_count: number_with_delimiter(@user_count))
+
+.prose
+  = linkify(@announcement.text)
+
+%hr.spacer/
+
+.content__heading__actions
+  = link_to t('admin.terms_of_service.preview.send_preview', email: current_user.email), admin_announcement_test_path(@announcement), method: :post, class: 'button button-secondary'
+  = link_to t('admin.terms_of_service.preview.send_to_all', count: @user_count, display_count: number_with_delimiter(@user_count)), admin_announcement_distribution_path(@announcement), method: :post, class: 'button', data: { confirm: t('admin.reports.are_you_sure') }

app/views/user_mailer/announcement_published.html.haml

@@ -0,0 +1,12 @@
+= content_for :heading do
+  = render 'application/mailer/heading',
+           image_url: frontend_asset_url('images/mailer-new/heading/user.png'),
+           title: t('user_mailer.announcement_published.title', domain: site_hostname)
+%table.email-w-full{ cellspacing: 0, cellpadding: 0, border: 0, role: 'presentation' }
+  %tr
+    %td.email-body-padding-td
+      %table.email-inner-card-table{ cellspacing: 0, cellpadding: 0, border: 0, role: 'presentation' }
+        %tr
+          %td.email-inner-card-td.email-prose
+            %p= t('user_mailer.announcement_published.description', domain: site_hostname)
+            = linkify(@announcement.text)

app/views/user_mailer/announcement_published.text.erb

@@ -0,0 +1,7 @@
+<%= t('user_mailer.announcement_published.title') %>
+
+===
+
+<%= t('user_mailer.announcement_published.description', domain: site_hostname) %>
+
+<%= @announcement.text %>