Bugfix/end to end encryption various fixes

[mgallien]

Resolves

#

Summary

TODO

• ...

Checklist

• Sign-off message is added to all commits.
• The commit history is clean with no merge commits.
  • How to rebase your commits
  • How to squash commits with rebase
• Uploaded screenshots from before and after for UI changes.
• Test(s) added to branch, with before/after results included in PR description, for performance improvements where applicable.
• Documentation has been updated or is not required.
• Backports requested where applicable (critical bugfixes).
• Labels added where applicable (bug/enhancement).
• Milestone added for target version.

AI (if applicable)

• The content of this PR was partly or fully generated using AI
  • I have read the guidelines for AI-assisted contributions.
  • I have read Nextcloud's AI Contribution Policy.

[mgallien]

/backport to stable-33.0 please

[mgallien]

/backport to stable-34.0 please

[mgallien]

/backport to stable-4.0 please

[github-actions]

Artifact containing the AppImage: nextcloud-appimage-pr-10414.zip

Digest: sha256:f732ffdc955561c02b7c7e270e32f5a21d2444b07d16b3240805d495842cf415

To test this change/fix you can download the above artifact file, unzip it, and run it.

Please make sure to quit your existing Nextcloud app and backup your data.

[sonarqubecloud]

Quality Gate failed

Failed conditions
14.8% Coverage on New Code (required ≥ 80%)
150 New Code Smells (required ≤ 0)
E Maintainability Rating on New Code (required ≥ A)
D Security Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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