🛂(frontend) secure download button

Blocknote download button opens the file in a new
tab, which could be not secure because of XSS attacks.
We replace the download button with a new one that
downloads the file instead of opening it in a new tab.
Some files are flags as unsafe (SVG / js / exe),
for these files we add a confirmation modal before
downloading the file to prevent the user from
downloading a file that could be harmful.
In the future, we could add other security layers
from this model, to analyze the file before
downloading it by example.

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to
 ## Added
 
 - 💄(frontend) add error pages #643
+- 🔒️ Manage unsafe attachments #663
 - ✨(frontend) Custom block quote with export #646
 - ✨(frontend) add open source section homepage #666