Translation composer missing image upload support

[lhkjacky (Jacky)]

Manual translation composer does not support image upload or paste (console: this.drop is not a function)

Description:
When editing a post’s manual localization via “Translate → Edit localization manually”, the translation composer does not allow image uploads or pasting images.

Steps to reproduce:

1. Open any post with the Discourse Translation feature enabled.

2. Click the “Translate” button → choose “Edit localization manually.”

3. Try to:

   • drag an image into the translation composer, or

   • paste an image from clipboard.

4. Nothing happens — uploads are ignored, and the browser console shows errors.

Observed behavior:

• Image upload and paste do not work.

• Console errors:

  Uncaught TypeError: this.drop is not a function
      at Object.handleEvent (content.js:1)
  
  

  and

  PresenceChannel '/discourse-presence/undefined/...' not found
  
  

• Indicates missing drop handler and topic_id context in post-translation-editor.gjs.

Expected behavior:

• Allow uploads/pasting like the normal composer for translated image.

Notes:
Seems the translation composer runs in a simplified editor context without composer-upload integration. A fix could be adding upload handling.

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