Move ActiveAgentsPanel between AgentMetricsBar and the main agent
collection so live work is visible without scrolling past the whole
agent directory. Add a "Next heartbeat in Xs" line to each card
footer (or "Heartbeat overdue" when negative), driven by
runtimeConfig.heartbeatIntervalMs with the dashboard default fallback.
Give cards a pointer cursor + hover/focus styling so the existing
click-to-select behavior is discoverable.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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