chore: Minor clean-up for some Controller components

[matthewlipski]

Summary

This PR cleans up the LinkToolbarController, FloatingComposerController, and FloatingThreadController components.

Rationale

These are minor improvements but improvements nonetheless.

Changes

• Merged selectionLink and mouseHoveredLink states in LinkToolbarController, improved naming.
• Removed redundant open states in FloatingComposerController and FloatingThreadController.

Impact

N/A

Testing

Went through the Notion UI testing doc to ensure no regressions.

Screenshots/Video

N/A

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

Additional Notes

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Project	Deployment	Preview	Updated (UTC)
blocknote	Ready	Preview	Dec 3, 2025 5:27pm
blocknote-website	Error		Dec 3, 2025 5:27pm

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commit: 69ddfd7

[nperez0111]

Looks like good cleanup