feat: implement Material 3 typography tokens and classes

[treeder]

This PR adds the M3 type scale tokens, classes, and helper styles under typography/md-typescale.js and updates md-typescale-styles.js for backward compatibility.

[gemini-code-assist]

Code Review

This pull request introduces Material Design 3 Expressive indicators, adding a morphing geometric 'md-loading' component and extending 'md-progress' with wavy circular and linear tracks. It also refactors typography styles into a centralized 'md-typescale.js' module. Feedback focuses on optimizing animation performance by pausing the animation loop when inactive and caching DOM queries. Additionally, several robustness improvements are recommended, including preventing infinite loops from non-finite progress values, avoiding stack overflows from circular CSS variable references, ensuring SSR compatibility, and adding defensive null checks for canvas contexts.

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