refactor: inline classes.trie as Uint8Array & drop base64-js usage at runtime

[dartess]

Initially, I wanted to update the base64-js library to avoid duplication in my project (it's currently fixed here while the rest of the project uses latest version,1.5.1).

Then I realized that updating the dependency wasn't a stable solution. Instead, I wanted to move base64-js to devDependencies by removing the runtime decoding entirely — since the decoding can be done at the data preparation stage.

Finally, I realized there's no need to generate, read, or decode base64 at all. We can directly write the "raw" Uint8Array to a generated file. With this approach, base64-js becomes completely unnecessary.

[blikblum]

Great work