fix: simplify local start - remove pnpm from preview script, make it work on Windows and not fail due to bindings

[wonderwhy-er]

This is a small 2-line change to cleanup run scripts to work better on Windows

Want to make a video on youtube of how to run Bolt.New on windows locally in the simplest way, 2 things complicate it unnecessarily. And I fix them here, its just 2 lines.

1. I removed pnpm from the preview as other commands use npm anyway and it removes one additional thing for beginners to install and use. npm is good enough for general repo.
2. I added a fallback for Windows not to use bindings. They are not used currently for local running always.

This should not break Docker part but I don't use docker so would be nice if someone who does checks

[felipe2g]

its a big decision remove pnpm, if community approve we need remove the pnpm.lock file and include npm

another thing we have to consider is, officia bolt use then...

[wonderwhy-er]

its a big decision remove pnpm, if community approve we need remove the pnpm.lock file and include npm

another thing we have to consider is, officia bolt use then...

Hm, valid point about pnpm.lock and keep in sync with the official repo.
I 100% agree with you that trying to stay closer so we can merge with changes in it in the future is something I would like to do for now.

But build and start commands use npm. While preview does not and it calls build and start commands.
I think it's still valid to keep those things in sync, why require pnpm only for preview?

The reason this came up for me is that I was trying to show people how to install it locally and it required an additional step for them to add pnpm with no real benefit for them.

That is just my thoughts. I can accept the desire to remove pnpm change line.

[wonderwhy-er]

Pushed in a fix, just was testing installation on old Windows latop script I had before that did not work so well, changed to 3 scripts
start:windows
start:UNIX

and start now uses node script to decide which one to run

Tested on Mac and Windows 10

[syndicate604]

PNPM doesn't work well on Ubuntu even in a venv, so on linux I just use npm and it works fine.
Also chrome canary doesn't work with ubuntu either.