The guest table marks with "!" each guest that Proxmox's not-backed-up
list returns. The frame's bottom border shows the count, e.g.
"mainframe · 2 without backup job". This uses Proxmox's own answer, so
it also counts jobs that select guests by pool.
If the coverage call fails, the guests are still listed and a warning
says the coverage is unknown.
Closes#9
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
DuckbootandClaude Opus 5.5