Generates CSS rules from the manifest's class entries.

This module handles the generation of the main CSS rules for style classes, including:

• LTR and RTL rule generation
• CSS layer wrapping (optional, matching StyleX's useLayers option)
• Selector building with specificity bumping
• Fallback value processing
• Selector prefixing (e.g., ::thumb, ::placeholder)

Configuration

Behavior is controlled by LiveStyle.Config:

• use_css_layers: true - Group rules by priority in @layer priorityN blocks (StyleX useLayers: true)
• use_css_layers: false (default) - Use :not(#\#) selector hack (StyleX default)