[Bug] Bulk upload form submission is broken (Turbo conflict)

[mnietona]

Description

When trying to submit a bulk upload link (Google Drive, WeTransfer, etc.) for a course, clicking the "Envoyer" button does nothing. No error is shown in the UI.

Steps to Reproduce

1. Go to any course page.
2. Click on "Ajouter un document".
3. Scroll down to the "Import de masse" section.
4. Enter a valid URL and click "Envoyer".

Expected Behavior

The user should be redirected to the success page: /documents/submit-bulk/<course_slug>.

Actual Behavior

Nothing happens. The form is intercepted but the redirect is not followed.

[C4ptainCrunch]

I see this in my console when trying to reproduce. It seems to be the culprit. We should try to fix this error instead of removing turbo (like in #370)

[C4ptainCrunch]

On the form, few comments for next time:

• Why is the text of the issue in quotes ? (every line with >)
• It's quicker for me to check if you add a direct link to the page (you can use the course text-x-100 to "test in production")
• If it looks like a frontend bug, always check the console (and include it in the issue if relevant)
• If you open an issue and then directly open a PR, you can just skip the issue and write the text in the PR

[mnietona]

Thanks for the tips !

• The quotes (>) were just a bad markdown habit on my end, I'll drop them!

Regarding the bug itself, you were totally right about the console error. I've closed the old PR and opened a new clean one (#377) that actually fixes the underlying Django view to respect Turbo's PRG requirement, instead of just bypassing it.

Thanks for pointing me in the right direction!