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/builders/messages/facebook/message_builder_spec.rb

@@ -89,6 +89,57 @@ describe Messages::Facebook::MessageBuilder do
       expect(message.content_attributes['external_echo']).to be true
     end
 
+    context 'when message contains a reel attachment' do
+      let(:reel_message_object) do
+        {
+          messaging: {
+            sender: { id: '3383290475046708' },
+            recipient: { id: facebook_channel.page_id },
+            timestamp: 1_772_452_164_516,
+            message: {
+              mid: 'm_reel_test',
+              attachments: [
+                {
+                  type: 'reel',
+                  payload: {
+                    url: 'https://www.facebook.com/reel/123456',
+                    title: 'Test Reel Title',
+                    reel_video_id: 123_456
+                  }
+                }
+              ]
+            }
+          }
+        }.to_json
+      end
+      let(:reel_message) { Integrations::Facebook::MessageParser.new(reel_message_object) }
+
+      before do
+        allow(Koala::Facebook::API).to receive(:new).and_return(fb_object)
+        allow(fb_object).to receive(:get_object).and_return(
+          { first_name: 'Jane', last_name: 'Dae', profile_pic: 'https://chatwoot-assets.local/sample.png' }.with_indifferent_access
+        )
+      end
+
+      it 'creates an ig_reel attachment without downloading the file' do
+        expect(Down).not_to receive(:download)
+        described_class.new(reel_message, facebook_channel.inbox).perform
+
+        message = facebook_channel.inbox.messages.find_by(source_id: 'm_reel_test')
+        expect(message).to be_present
+        expect(message.attachments.first.file_type).to eq('ig_reel')
+        expect(message.attachments.first.external_url).to eq('https://www.facebook.com/reel/123456')
+        expect(message.attachments.first.file.attached?).to be false
+      end
+
+      it 'sets the reel URL as message content' do
+        described_class.new(reel_message, facebook_channel.inbox).perform
+
+        message = facebook_channel.inbox.messages.find_by(source_id: 'm_reel_test')
+        expect(message.content).to eq('https://www.facebook.com/reel/123456')
+      end
+    end
+
     context 'when lock to single conversation' do
       subject(:mocked_message_builder) do
         described_class.new(mocked_incoming_fb_text_message, facebook_channel.inbox).perform