feat: Modernize UI with design tokens and theming

[dblythy]

Summary

• Add CSS custom properties design system with three themes: light (default), dark, and classic
• Modernize all components and pages to shadcn-inspired styling (stacked forms, compact inputs, clean spacing)
• Classic theme ([data-theme="classic"]) preserves the original Parse Dashboard look and feel
• Add mobile navigation with hamburger menu for <768px viewports

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[parseplatformorg]

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