feat: connenctivity view: move quota up and combine with IMAP state.

[Simon-Laux]

like described in #7630 (comment)

classical account (with legacy option mvbox)

multi transport

[r10s]

nice!

for the layout:

• the empty line to divide relays should always be there, unconditionally.
  this makes the layout easier to follow if only parts cannot connect, and it will also result in less bumping on flaky network

• the "green" color of the progress bar is now irritating as mixed with green/yellow/red connected/connecting/disconnected lights.
  just use a neutral grey there, #808080, which will fit in darkmode as well as in lightmode

[iequidoo]

Do we really need these usage progress bars? Usually percentage is important, so maybe just display smth like 12.3% of 100 MiB used? It's not hard to multiply two numbers if usage in bytes is needed. Just a suggestion, the current layout looks good too