fix(build): inline hexColors in index.js for browser bundler compatibility

[chungty]

Summary

The JS entry (`build/dist/index.js`) previously read `hex/colors.json` at runtime via `node:fs`, which fails in any browser-targeted bundler — Webpack, Vite (browser), Remotion — with:

```
UnhandledSchemeError: Reading from "node:fs" is not handled by plugins.
```

This blocks consuming `hexColors` from the Remotion scaffold in verdigristech/verdigris (Z2O-1029).

Fix

Inline the hex values directly into `index.js` at build time. No runtime filesystem dependency, so the package works everywhere: Node, SSR, Vite, Webpack, Remotion.

Public API

Unchanged. `hexColors` is still exported as `Record<string, string>`, same keys, same values.

Test plan

• `npm run build` produces inlined `build/dist/index.js`
• `head -5 build/dist/index.js` shows hex values, no `node:fs` import
• Downstream smoke-test: Remotion render in verdigris-remotion consumes this without bundler error
• Tag as `v0.6.0` after merge so consumers can pin

[coderabbitai]

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch fix/inline-hex-colors-for-browser-bundlers

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