fix(previewOptions): only render link preview options if editor is editable

[silverkszlo]

📝 Summary

This previous fix #8257 did not resolve the bug entirely as sometimes it appeared and sometimes not. Now editor.options.editable is being checked in props.decorations on every view render, including after sedEditable(), regardless of whether a transaction was dispatched.

To reproduce:

• Add a link to a document
• create a public share of this document wird view only permissions
• open that share in another browser (as a non-logged in user)
• preview options of the link should not be editable at all

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits
• Tests (unit, integration and/or end-to-end) passing and the changes are covered with tests
• Documentation (README or documentation) has been updated or is not required

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/plugins/previewOptions.js	33.33%	2 Missing ⚠️

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