fix(bankai): survive real-world CSS and serve real media types

Lightning CSS refuses IE-era hacks (*zoom and friends) that established
libraries like tachyons still carry; enable errorRecovery so bankai
strips them instead of failing the build — a zero-config tool ingesting
decade-old CSS should shrug, not crash. Found migrating an actual choo
v7 production site. Also: proper MIME types for avif/jpg/gif/mp4/woff in
the static server.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014NgfSjHE11oFpoSnLVKLXd

packages/bankai/lib/serve.js

@@ -31,8 +31,14 @@ const MIME = {
   '.map': 'application/json',
   '.txt': 'text/plain; charset=utf-8',
   '.woff2': 'font/woff2',
+  '.woff': 'font/woff',
   '.png': 'image/png',
+  '.jpg': 'image/jpeg',
+  '.jpeg': 'image/jpeg',
+  '.gif': 'image/gif',
   '.webp': 'image/webp',
+  '.avif': 'image/avif',
+  '.mp4': 'video/mp4',
   '.ico': 'image/x-icon'
 }