Glass Style Handbook Documentation

[andrew-ronaldson]

Create comprehensive documentation for the new 'glass style' guidelines introduced in PF 6.5, including design principles, usage examples, and migration advice for consumers adopting the style in products.

Topics from design team

• Background image considerations (ex: text on images)
• Avoid theming overrides
• User controls to enable/disable Glass
• Role of User preferences for High-contrast and prefers-reduced-transparency
• Citing research if/when possible

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Jira Issue: PF-3679