fix: Handle Facebook reel attachment type (#13691)

Fixes https://linear.app/chatwoot/issue/PLA-96/argumenterror-reel-is-not-a-valid-file-type-argumenterror
Fixes a crash in `when a user shares a Facebook reel via Messenger.
Facebook sends these attachments with `type: "reel"`, which isn't a
valid `file_type` enum value on the Attachment model (only `ig_reel`
exists, matching Instagram's format).

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

spec/models/attachment_spec.rb

@@ -155,6 +155,30 @@ RSpec.describe Attachment do
     end
   end
 
+  describe 'push_event_data for ig_reel attachments' do
+    it 'returns external_url as data_url when no file is attached' do
+      attachment = message.attachments.create!(
+        account_id: message.account_id,
+        file_type: :ig_reel,
+        external_url: 'https://www.facebook.com/reel/123456'
+      )
+
+      event_data = attachment.push_event_data
+      expect(event_data[:data_url]).to eq('https://www.facebook.com/reel/123456')
+      expect(event_data[:thumb_url]).to eq('')
+    end
+
+    it 'returns file_url as data_url when file is attached' do
+      attachment = message.attachments.new(account_id: message.account_id, file_type: :ig_reel,
+                                           external_url: 'https://www.instagram.com/reel/123')
+      attachment.file.attach(io: Rails.root.join('spec/assets/avatar.png').open, filename: 'avatar.png', content_type: 'image/png')
+      attachment.save!
+
+      event_data = attachment.push_event_data
+      expect(event_data[:data_url]).to be_present
+    end
+  end
+
   describe 'push_event_data for embed attachments' do
     it 'returns external url as data_url' do
       attachment = message.attachments.create!(account_id: message.account_id, file_type: :embed, external_url: 'https://example.com/embed')