fix(pod): show SchedulingGated for pods held by scheduling gates - #4313

Problem

A pod held back by spec.schedulingGates shows Pending in the k9s pod view. kubectl, and k9s's own PodStatus helper, show SchedulingGated. That's the only hint that the pod is waiting on a gate rather than on the scheduler. kubectl's printPod does:

for _, condition := range pod.Status.Conditions {
    if condition.Type == api.PodScheduled && condition.Reason == api.PodReasonSchedulingGated {
        reason = api.PodReasonSchedulingGated
    }
}

Pod.Phase, which renders the STATUS column, skipped this check.

Fix

Pod.Phase now applies the same PodScheduled / SchedulingGated condition check as PodStatus.

Tests

New TestCheckPhase case scheduling-gated. It returned Pending before the fix and returns SchedulingGated now. go test ./internal/render/... ./internal/view/... passes.

AI-assisted: I directed the investigation and reviewed and verified the change myself.