Fix esbuild is actually not working, even if it is installed in a random nue project

[fritx]

This PR is based on PR #254 , and supposed to be merged after #254 is merged first.

Background:
I'm a Node user when I'm using my older MacOS. (Seems Bun is not supported in older MacOS, right?)
So I have to use Node + esbuild with nuekit.

The Bug:
Esbuild is actually not working, even if it is installed in a random nue-app.

Reason:
The chdir hack changes the actual cwd to nuekit srcdir, so getBundler is resolving esbuild from the the nuekit srcdir instead of the target nue-app dir.

Steps to reproduce:

# ensure nue srcdir is clean
# -- esbuild is not installed, as it is not declared in the dependencies
cd nuejs/nue
git checkout -- package.json pnpm-lock.yaml
rm package-lock.json yarn.lock
rm -rf node_modules

# linking to local nue srcdir
rm $(which nue) && (cd packages/nuekit && npm i && npm link) && which nue

# try to run nuekit
alias nu='node $(which nue)'
cd my_nue_app
npm i -D esbuild
rm -rf .dist && nu build && ls -la .dist/dev/@nue

# Actual Output
...
✓ Initialize .dist/dev: Bundler not found. Please use Bun or install esbuild
drwxr-xr-x  13 fritx  staff    416  4  7 16:36 .
drwxr-xr-x  11 fritx  staff    352  4  7 16:36 ..
-rw-r--r--   1 fritx  staff      0  4  7 16:36 .043

# Expected output
✓ Initialize .dist/dev: ••••••••••
...
drwxr-xr-x  13 fritx  staff    416  4  7 16:36 .
drwxr-xr-x  11 fritx  staff    352  4  7 16:36 ..
-rw-r--r--   1 fritx  staff      0  4  7 16:36 .043
-rw-r--r--  1 fritx  staff   1741  4  7 16:36 app-router.js
-rw-r--r--  1 fritx  staff  65144  4  7 16:36 diffdom.js
-rw-r--r--  1 fritx  staff   1199  4  7 16:36 error.css
-rw-r--r--  1 fritx  staff    966  4  7 16:36 error.js
-rw-r--r--  1 fritx  staff   2316  4  7 16:36 glow.css
-rw-r--r--  1 fritx  staff   2829  4  7 16:36 hotreload.js
-rw-r--r--  1 fritx  staff   1324  4  7 16:36 mount.js
-rw-r--r--  1 fritx  staff  10853  4  7 16:36 nue.js
-rw-r--r--  1 fritx  staff    660  4  7 16:36 nuemark.js
-rw-r--r--  1 fritx  staff   3346  4  7 16:36 page-router.js

[tipiirai]

wow. great fix. thank you!