fix(canvas): match block variant name case/spacing-insensitively

[shsteimer]

Description

Variant picker checkmark compared doc variant text against library variant names with strict equality, so casing/spacing differences (e.g. "wide" vs "Wide") left the picker unmatched.

Related Issue

Motivation and Context

How Has This Been Tested?

https://varmatch--da-live--adobe.aem.live/

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

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Commits

• f4d7caf ✅ (latest)
• 48d7fe8 ✅
• 3fc559a ✅
• 9c7266d ✅