Remove all dual-mode rendering logic since React is now the single
admin interface. Focus on implementing full table features in React.
Changes:
- Remove ?react= query param checks from all page methods
- Remove admin notice and footer toggle from ReactAdmin
- Simplify asset loading - ReactAdmin handles all assets
- Clean up Init.php enqueue method
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
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