perf: self-host fonts and eliminate render-blocking Typekit request

[KotaHusky]

Summary

The homepage loads fonts via an external Typekit (use.typekit.net/vxp7yul.css) stylesheet, which is a render-blocking request that Lighthouse flags as a performance issue. Additionally, FontAwesome icons are loaded from a kit CDN (kit.fontawesome.com). Both of these are third-party network dependencies that add latency on every page load and create single points of failure.

Current State

In app/layout.tsx:

<link rel="stylesheet" href="https://use.typekit.net/vxp7yul.css" precedence="default" />
<Script id="fontawesome" src="https://kit.fontawesome.com/cea9781086.js" ... />

Proposed Changes

1. Replace Typekit with next/font

• Use next/font/google or next/font/local to load the equivalent font (or swap to a close match available on Google Fonts)
• next/font automatically self-hosts, applies font-display: swap, and is zero render-blocking
• Eliminates the Typekit dependency entirely

2. Replace FontAwesome kit with @fortawesome/react-fontawesome

• Install @fortawesome/fontawesome-svg-core, @fortawesome/free-brands-svg-icons, @fortawesome/free-solid-svg-icons, @fortawesome/react-fontawesome
• Import only the specific icons used (GitHub, PyPI, Bluesky, Telegram) — tree-shakeable SVGs, no CDN request
• Removes the <Script> CDN tag from the layout entirely

Expected Impact

• Removes 2 render-blocking/external network requests per page load
• Reduces Cumulative Layout Shift (CLS) from font FOUT
• Page works correctly even when Typekit or FontAwesome CDN is unreachable (relevant for container deployments behind Cloudflare)
• Smaller JavaScript bundle (only the icons actually used, not the entire FA kit)

Acceptance Criteria

• next/font is used for body font; Typekit <link> is removed from layout
• FontAwesome CDN <Script> is removed from layout
• SocialIcon and TelegramModal use @fortawesome/react-fontawesome SVG components
• All icon sizes and hover styles are visually equivalent to current behavior
• Lighthouse performance score does not decrease (ideally improves)
• All existing tests pass