feat: show browser not supported popup at startup

[pajotg]

This PR adds a popup at startup when you are using a browser that doesn't support web-serial like firefox

[sverben]

Please first detect if we can use a fallback driver

[sverben]

Please copy the styling from the warning dialog, also differentiate between the recommended (primary) and secondary buttons with styling, in this case primary would probably be "I understand", and secondary "don't show again"

[pajotg]

This is what it looks like now.

Please first detect if we can use a fallback driver

Im hoping detecting if navigator.usb is what you meant with this, or would it need to attempt to connect?

[rmoesbergen]

Please first detect if we can use a fallback driver

Im hoping detecting if navigator.usb is what you meant with this, or would it need to attempt to connect?

The check is not correct this way, since firefox does support WebUSB, but we only support uploads to FTDI devices with WebUSB. So if you try to upload to a CH340 based device using firefox, you would not get the dialog, but the upload would fail. I don't think we can reliably check for this at startup, since you have to know which device is connected. I guess the check needs to move to after where the connection is made.

[koen1711]

@sverben @rmoesbergen I'm reviewing this and I see nothing wrong with this PR, all your concerns seem to be adressed? Can you confirm?

Old review