Tracer: Overview focuses active Bots with actionable cards and named Session tiles #698

Parent

Parent: #541. Related personal attention owner: #126. This follows the Human-approved Overview first tracer, without taking on its metrics expansion.

User behavior

From Activity Center / Overview, the Human primarily sees Bots with non-idle status or unresolved Human actions. Each Bot card shows its executing root Sessions and the actions waiting for the Human, so routine decisions can happen here while Inbox provides more detailed triage/context.

Acceptance

• Default to non-idle Bots; keep Bots with unresolved canonical Human actions visible even when execution is idle. Offer Show idle Bots to inspect the full roster; explain the empty state.
• Under each Bot, show only actually executing Orchestrator and Assignment roots as compact single-row tiles. Display the current native DSH Session name, distinguish roles with icons and accessible labels, and preserve exact native Session navigation. Fall back to existing purpose/role labels only when the native name is unavailable.
• Show the same unresolved Human action projection under its owning Bot, oldest first, with bounded pagination and usable loading/error/empty states. No second attention store or copied request lifecycle. Dismissed Inbox items follow the existing projection policy.
• Reuse Inbox independent native action forms/pickers and owning Host commands; opening/answering/approving from Overview stays in Overview. Provide source navigation and access to fuller context. Repair maintenance remains an explicit detail action.
• Successful decisions/dismissals update action rows and global action count; expired or concurrently resolved requests recheck canonical authority. Never count waiting/blocked Sessions as executing.
• Real DSH Before/After screenshots in light/dark and actual actions/navigation verification in the PR; pause for Human QA before another issue.

Boundaries

Existing activityOverview, HumanAttention query/commands, Host-to-Client Bridge and native Session list projection. Browser display state does not become authority. No metrics, background jobs, schema migration, new login or wake-policy changes.