The services panel's Logs tab renders the underlying container's logs
through the same code path, so bind 't' there as well and include the
tail value in the services context cache key so the tab re-renders
when the value changes. Also switch the tail-limiting writer to
SetContent so the clear+rewrite is atomic and the view never renders
empty in between.
Previously the selected --tail value only trimmed the initial log
snapshot; since logs are followed live afterwards, the view kept
growing unbounded past the chosen count. Now the main panel writer
re-truncates to the last N lines on every new line, so e.g. tail: 50
always shows only the 50 most recent lines. Behavior when
following logs to stdout (the 'm' keybinding) is unchanged, matching
plain `docker logs --tail N -f` there.
Lets you press 't' while focused on the containers panel to cycle
through common --tail presets (all, 50, 100, 200, 500) for the
selected container's Logs tab, instead of only being able to set a
fixed value via the logs.tail config option. The current value is
shown in the Logs tab subtitle.
