fix(ai): make sure ShowSelection works

[YousefED]

Summary

The showSelection(false) effect cleanup in the Link button was interfering with the AI extension. What happened:

• formatting toolbar opens
• user clicks AI Extension
• AI Extension opens and sets showSelection(true)
• Formatting toolbar closes and link button unmounts, calling showSelection(false)

Rationale

This keys the showSelection by "consumer". @nperez0111 let me know what you think if this, open to other solutions

Changes

Impact

Testing

Manual

Checklist

• Code follows the project's coding standards.
• Unit tests covering the new feature have been added.
• All existing tests pass.
• The documentation has been updated to reflect the new feature

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Project	Deployment	Review	Updated (UTC)
blocknote	Ready	Preview	Dec 16, 2025 11:46am
blocknote-agent-demo	Error		Dec 16, 2025 11:46am
blocknote-website	Ready	Preview	Dec 16, 2025 11:46am

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commit: 522a939