Replace fleet/actor-overview/actor-dossier/workers views and the root link
list with one ControlPlaneView serving / and /view/fleet: node cards fuse
machine stats with actor rollup, node click opens machine detail + roster,
actor click opens an in-page dossier (identity, message diet, sparkline,
sampled message history via /api/view/fleet/detail).
- Message history folds view-side from messages_processed deltas: 16-receipt
ring, 250ms spacing, sampled-out counters — noisy actors cannot flood the
page and producers stay untouched.
- Stale streams render in a separate collapsed pool; superseded life
generations are evicted immediately; stale pool hard-capped at 50.
- Unified navbar injected server-side from the view registry; pages opt in
with a <!--swactor:nav--> placeholder so app-registered views appear
automatically. Hardcoded per-page navs stripped.
- Rust type names are the actor display name; address is the unique key.
Stale doc comment claiming types are not on the frame fixed.
