* Remove usage of emscripten's allocate function.

This function is deprecated upstream.

* fix variable name

* Avoid lengthBytesUTF8

* lint

* remove usage of deprecated allocateUTF8OnStack

---------

Co-authored-by: lovasoa <contact@ophir.dev>

…ings in bundlers (#622)

When bundling sql.js for browser environments, tools like Vite, Webpack,
and esbuild emit warnings about `require("node:fs")` and
`require("node:crypto")` being externalized for browser compatibility.

This adds a new `sql-wasm-browser.js` build variant compiled with
`-s ENVIRONMENT=web,worker`, which completely eliminates Node.js code
paths from the generated JavaScript. The browser variant is exposed via
the `exports` field in package.json using the `browser` condition, so
bundlers automatically select the clean version.

The original `sql-wasm.js` with full Node.js support is preserved as
the `default` export, ensuring no breaking changes for existing users.

Closes #620

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>