Fix autolink inside shadow dom

[sasunstepanyan777]

Changes Overview

Enhanced link detection and sanitization to be more robust and Unicode-compliant, especially within shadow DOM contexts.

Implementation Approach

• Improved how whitespace is handled when detecting and processing autolinks, especially to support the shadow DOM case.
• Added a new helper file (whitespace.ts) that defines Unicode whitespace regular expressions, based on DOMPurify's implementation.
• Updated autolink.ts to use these new Unicode-aware whitespace checks, replacing previous plain space checks and logic.
• Updated link.ts to use the new Unicode whitespace regex for sanitizing URIs, replacing the previous hardcoded regex.

Testing Done

Manual

Verification Steps

Place Editor inside shadow dom

Additional Notes

Checklist

• [ ] I have created a changeset for this PR if necessary.
• [x] My changes do not break the library.
• [ ] I have added tests where applicable.
• [x] I have followed the project guidelines.
• [ ] I have fixed any lint issues.

Related Issues

Fixes #6439

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Latest commit: 473ba2e13caba6f53b5def0be4f31c045af7fcfd

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