feat: show crawled document details and FAQ counts in Captain (#14863)

- Add a document details view that surfaces crawled content, source
metadata, and generated FAQ counts.
- Rename the document card action to open details and show the FAQ count
inline in the list.
- Return `responses_count` from the documents API efficiently and expose
document content in the show payload.
- Update related Captain copy to reflect the new details-oriented flow. 


**Preview**
<img width="1640" height="1596" alt="CleanShot 2026-06-26 at 09 25
15@2x"
src="https://github.com/user-attachments/assets/0c408fae-7d37-422a-8869-ece466292cb1"
/>

---------

Co-authored-by: Muhsin <12408980+muhsin-k@users.noreply.github.com>
Co-authored-by: Sony Mathew <sony@chatwoot.com>
Co-authored-by: Sony Mathew <2040199+sony-mathew@users.noreply.github.com>

app/javascript/shared/helpers/MessageFormatter.js

@@ -104,6 +104,11 @@ class MessageFormatter {
     return this.md.render(updatedMessage);
   }
 
+  disableImageRendering() {
+    this.md.disable(['add-image-sizing']);
+    this.md.renderer.rules.image = () => '';
+  }
+
   get formattedMessage() {
     return this.formatMessage();
   }