Federation page improvements

[rkfg]

This PR hides zero last retry timestamps that are displayed as 1970/01/01 00:00:00 (misleading) and also improves the dark theme. Without this patch the white rows also have white text in them so the text is invisible unless you point at them, pink rows also have white text that's hard to read, and the reconnect button's color is too bright.

[awesome-manuel]

Thanks for your contribution. Can you please post some pre and post screenshots, so that I get an impression what exactly is fixed?

[rkfg]

Sure, here's what it looks like now: and with the patch:

Maybe the black background isn't the best choice and instead we should use the default from the theme?

[awesome-manuel]

Yes, also instead of #ffcccc a theme color should be used.

[rkfg]

Setting the color to undefined (for the non-highlighted rows) is much better! I'm not sure what color to use from the theme.

[rkfg]

How about this? I used the warning color from the theme and a slight button color correction. Without that it looks bad:

[rkfg]

Alternatively, using the error color with lighten by 0.5 (otherwise it's too aggresively red):

Tell me what you prefer.

[dklimpel]

Fixes:

• #627

[jk779]

can we merge this? 😎 the white theme burns my skin! ;)

[rkfg]

It should now use the theme colors.

[jk779]

looks good! :)