fix: Captain response builder not getting triggered (#12729)

## Summary
- Fix captain response builder not getting triggered for cases where
responses are created as completed.

## Testing Instructions 
- Test articles with firecrawl
- Test articles without firecrawl
- Test PDF documents

---------

Co-authored-by: Pranav <pranav@chatwoot.com>

enterprise/app/models/captain/document.rb

@@ -37,6 +37,7 @@ class Captain::Document < ApplicationRecord
   validate :validate_file_attachment, if: -> { pdf_file.attached? }
   before_validation :ensure_account_id
   before_validation :set_external_link_for_pdf
+  before_validation :normalize_external_link
 
   enum status: {
     in_progress: 0,
@@ -47,7 +48,7 @@ class Captain::Document < ApplicationRecord
   after_create_commit :enqueue_crawl_job
   after_create_commit :update_document_usage
   after_destroy :update_document_usage
-  after_commit :enqueue_response_builder_job, on: :update, if: :should_enqueue_response_builder?
+  after_commit :enqueue_response_builder_job
   scope :ordered, -> { order(created_at: :desc) }
 
   scope :for_account, ->(account_id) { where(account_id: account_id) }
@@ -94,15 +95,18 @@ class Captain::Document < ApplicationRecord
   end
 
   def enqueue_response_builder_job
-    return if status != 'available'
+    return unless should_enqueue_response_builder?
 
     Captain::Documents::ResponseBuilderJob.perform_later(self)
   end
 
   def should_enqueue_response_builder?
-    # Only enqueue when status changes to available
-    # Avoid re-enqueueing when metadata is updated by the job itself
-    saved_change_to_status? && status == 'available'
+    return false if destroyed?
+    return false unless available?
+
+    return saved_change_to_status? if pdf_document?
+
+    (saved_change_to_status? || saved_change_to_content?) && content.present?
   end
 
   def update_document_usage
@@ -140,4 +144,11 @@ class Captain::Document < ApplicationRecord
     timestamp = Time.current.strftime('%Y%m%d%H%M%S')
     self.external_link = "PDF: #{pdf_file.filename.base}_#{timestamp}"
   end
+
+  def normalize_external_link
+    return if external_link.blank?
+    return if pdf_document?
+
+    self.external_link = external_link.delete_suffix('/')
+  end
 end