Fix so the latest downloaded log entries are always timely propagated
See FIXMEs:
- https://git.glasklar.is/rgdd/silentct/-/blob/main/internal/monitor/tail.go?ref_type=heads#L83
- https://git.glasklar.is/rgdd/silentct/-/blob/main/internal/monitor/tail.go?ref_type=heads#L92
In particular annoying for logs that don't grow quickly and so are pretty much stuck until 4096 new entries are available to be persisted.
Edited by Rasmus Dahlberg