Display connection error in sidebar.html

[fregante]

Since the sidebar now can be opened somewhat reliably, with some known exceptions, we can use the sidebar itself to display the connection status, rather than alert() and notifications as I had previously suggested.

Demo

Note

Actual injection failures are already handled by:

• #4192

and known exceptions by:

• #4180
• #4188

Related

• https://github.com/pixiebrix/pixiebrix-extension/issues/4178
• https://github.com/pixiebrix/pixiebrix-extension/issues/4115