WordPress 7.0 design compatibility

[rami-elementor]

✨ PR Description

Purpose: Update admin notice styling to comply with WordPress 7.0 design system requirements for consistent visual presentation across the plugin interface.

Main changes:

• Refactored admin notice CSS from table-based layout to flexbox with modern spacing and border properties
• Replaced heading level from h4 to h3 in sticky deprecation notice for improved semantic hierarchy
• Migrated RTL-specific border styles to logical CSS properties (border-inline-start) for better internationalization support

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