fix(links): Use custom link handling only for text-only links

[mejo-]

All other links inside the editor (like previews via reference widgets or links in mermaid diagrams) should be treated the standard way.

Fixes: #7384

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits

[mejo-]

/backport to stable31

[mejo-]

/backport to stable30

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 10 lines in your changes missing coverage. Please review.

Project coverage is 59.57%. Comparing base (e522c75) to head (e955bfd).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/plugins/links.js	9.09%	10 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #7385 +/- ##
==========================================
+ Coverage 52.67% 59.57% +6.90% 
==========================================
Files 487 486 -1 Lines 42237 37342 -4895 Branches 1098 1097 -1 ==========================================
Hits 22247 22247 + Misses 19883 14989 -4894 + Partials 107 106 -1 

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[max-nextcloud]

Makes sense code-wise. Tested that it does not break previews in collectives. They still open in the same tab.

[max-nextcloud]

/backport to stable31

[backportbot]

The backport to stable31 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable31
git pull origin stable31
# Create the new backport branch
git checkout -b backport/7385/stable31
# Cherry pick the change from the commit sha1 of the change against the default branch# This might cause conflicts, resolve them
git cherry-pick e955bfdc
# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/7385/stable31

Error: Failed to create pull request: Validation Failed: {"resource":"PullRequest","code":"custom","message":"A pull request already exists for nextcloud:backport/7385/stable31."} - https://docs.github.com/rest/pulls/pulls#create-a-pull-request

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.