Fixed button group global settings

[girishpanchal30]

Closes #2267

Summary

Fixed the mapping of the font-related attributes.

Checklist before the final review

• Included E2E or unit tests for the changes in this PR.
• Visual elements are not affected by independent changes.
• It is at least compatible with the minimum WordPress version.
• It loads additional script in frontend only if it is required.
• Does not impact the Core Web Vitals.
• In case of deprecation, old blocks are safely migrated.
• It is usable in Widgets and FSE.
• Copy/Paste is working if the attributes are modified.
• PR is following the best practices

[Copilot]

Pull request overview

Fixes the global defaults panel for the Button Group block where the typography "Appearance" and "Letter Case" controls were wired to the wrong attributes (fontVariant/fontStyle), preventing those settings from being saved/rendered correctly. The new mapping (fontStyle for appearance, textTransform for letter case) matches the block's own inspector (src/blocks/blocks/button-group/group/inspector.js:441-451) and the front-end CSS output (edit.js:110-111).

Changes:

• Map appearance ↔ fontStyle instead of fontVariant in both read and write of componentsValue/onChange.
• Map letterCase ↔ textTransform instead of fontStyle.

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Bundle Size Diff

Package	Old Size	New Size	Diff
Animations	276.77 KB	276.77 KB	0 B (0.00%)
Blocks	1.55 MB	1.55 MB	4 B (0.00%)
CSS	105.9 KB	105.9 KB	0 B (0.00%)
Dashboard	204.08 KB	204.08 KB	0 B (0.00%)
Onboarding	165.94 KB	165.94 KB	0 B (0.00%)
Export Import	102.86 KB	102.86 KB	0 B (0.00%)
Pro	412.66 KB	412.66 KB	0 B (0.00%)

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E2E Tests

Playwright Test Status:

Performance Results

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