Fix biome lint / check errors in all JS files

[jbampton]

Removing src/assets/js/**/*.js from the includes list prevents Biome from linting and formatting the project's JavaScript source code. Since Biome is primarily designed for JavaScript/TypeScript, JSON, and CSS, and does not currently support Nunjucks (.njk) or YAML, this change effectively disables Biome for the most relevant parts of the codebase. It is recommended to include the JavaScript directory and remove unsupported file types to keep the configuration effective.

    "includes": ["**/*.json", "src/assets/js/**/*.js"]

Originally posted by @gemini-code-assist[bot] in #405 (comment)