Logs: interactive T lookback (since/tail) for kubelet logs, like k9s

[Slach]

Today T sets the lookback only in VictoriaLogs views. In the plain kubelet Logs view (l) the window is limited to the fixed 0–5 anchors (tail/1m/5m/15m/30m/1h); anything else, e.g. last 24h, needs [logs] since in the config and a restart.

Ask: make T work in the kubelet Logs view too: prompt for a duration (s/m/h/d, same parser as the provider lookback), optionally tail, and re-stream with since_seconds/tail_lines. k9s has this UX (t toggles/0-5 for since, sinceSeconds configurable on the fly), and it is the missing piece for "show me the last day of this container".

Note: F already gives borderless fullscreen for clean copy in Logs, so nothing needed there.

Happy to implement once the scope is agreed.

[nklmilojevic]

Agreed: add a T prompt for durations or tail in kubelet Logs views. Keep existing line and buffer limits, fixed time anchors, and provider behavior. The issue defines stream replacement and tests.

Implementation scope and acceptance checks: #644