feat(critters): improve animation parsing and font preloading

[riceharvest]

This PR addresses issue #104 by improving the critters package:

• Improved animation declaration parsing in runtime.js to extract specific names rather than using lazy matching. Now only actual @Keyframes names that exist in the stylesheet are considered.
• Enhanced font parsing to generate multiple type-specific preloads (e.g., font/woff2). The MIME type is derived from the CSS format() or inferred from file extension when not specified.
• Removed unnecessary direct DOM property access (attribs) not required for css-select integration; replaced with getAttributeNames() method.

All tests pass.

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.

[riceharvest]

Superseded by #104 which is closer to green