Refactor website styles and bump deps

[aeiwz]

This pull request updates several dependencies and refines the documentation site’s visual design and typography. The most important changes include upgrading core packages (next, mermaid, uuid, and others), enhancing the CSS for improved documentation layout and readability, and standardizing font usage and code block styling.

Dependency Upgrades:

• Upgraded next and all related SWC platform-specific packages from 16.2.3 to 16.2.6 for bug fixes and improved stability. (website/package.json, website/package-lock.json) [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]
• Upgraded mermaid from 10.9.5 to 10.9.6 and broadened its uuid dependency range for compatibility with new uuid versions. (website/package.json, website/package-lock.json) [1] [2] [3]
• Upgraded uuid from 9.0.1 to 14.0.0 for improved performance and features. (website/package-lock.json)
• Upgraded dompurify from 3.3.3 to 3.4.7 for enhanced security. (website/package-lock.json)

Documentation Site Visual and Typography Improvements:

• Standardized font usage across the site, introducing --font-sans, --font-heading, and --font-mono variables, and improved code block color and border styling for better readability. (website/src/app/globals.css) [1] [2]
• Overhauled docs layout and sidebar styling: reduced border radius, adjusted paddings, font sizes, and weights for a more modern, consistent look; improved hover and active states for navigation links. (website/src/app/globals.css) [1] [2]
• Enhanced documentation prose styles: improved heading hierarchy, spacing, and border usage for better content structure and legibility. (website/src/app/globals.css)
• Applied font smoothing and improved line heights for overall text rendering quality. (website/src/app/globals.css)

These changes collectively modernize the documentation experience and keep dependencies up to date.Overhaul website styling and typography: replace Google font imports with system fonts, remove font variables from the HTML root, and apply extensive layout/visual refinements in globals.css (docs, sidebar, topbar, prose, tables, code blocks, responsive tweaks). Update layout.js to stop loading next/font Google fonts. Bump website dependencies (next to 16.2.6, mermaid to 10.9.6) and update package-lock.json accordingly (various @next and swc packages, dompurify, uuid, etc.). Update .gitignore to ignore .DS_Store, benchmarks/.DS_Store and /website/.agents; benchmarks/.DS_Store file updated.

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