WASM: Rewrite frontend app

[jpcano]

I rewrote the code, making it cleaner and adding the following new features:

• Long key press now works (useful to trigger the command help, among other things).
• Implemented buzzer beeps for the web app.
• A new look closer to a physical calculator.
• The keyboard layout is now defined as SVG rather than a canvas, making the key responses snappier and the design easier to iterate on.
• A hot-reload dev environment (provided by Vite)
• A way to easily update the app if we modify the keyboard skin (see README).

The code is still simple HTML+JS(ES6) without any build step in order not to complicate things, and to make it easier to read.

[c3d]

Wow, thanks a lot, @jpcano. I'll take a look and see if I can merge this quickly.

[c3d]

Overall, I like it, but I need to understand how to deploy it on https://48calc.org. It looks like I need to npm install several modules, and probably find a way deploy that on the web site.

[jpcano]

Overall, I like it, but I need to understand how to deploy it on https://48calc.org. It looks like I need to npm install several modules, and probably find a way deploy that on the website.

@c3d There is no need to do any npm to deploy this to your website. I've just added the following instructions in the README:

Production deployment

There is no build step for the app, just serve all the files inside public/ + the file index.html with any web server. Be sure to place all the files in the same directory level.