swarm.js: drop per-agent pending-badge fallback, transients-only now

mara, on review: "swarm.js should not need to pull in the jobq to do
its job" followed by "remove the per agent pending stuff - only show
what is running."

Deletes queuedOpsByAgent() entirely — no more per-agent badge derived
from Pending-state job-queue nodes. A card's pending badges are now
driven exclusively by transientsState (i.e. actually-running work);
queued-but-not-started work shows nothing on the card until a node
starts. jobqNodesState + refreshJobqGraph() stay, now feeding only
the queue-summary banner (a separate, still-open question — mara
separately asked for a dedicated rollup endpoint for that, tracked
apart from this PR).

Collapses the now-always-coincident `pending`/`pending-running` row
classes into one (`pending-running`) — there's no more queued-only
row state to visually distinguish it from.

docs/web-ui/dashboard.md's Container-row section rewritten to match:
the two-store priority-fallback description is gone, replaced with
"transients only."

frontend/packages/dashboard/src/dashboard.css

@@ -347,8 +347,11 @@ hive-agent-menu {
 .container-row:hover hive-agent-menu {
   --menu-btn-opacity: 1;
 }
-/* Pending state splits queued vs running. */
-.container-row.pending .actions { opacity: 0.4; pointer-events: none; }
+/* Card actions dim while a row has any pending-state badge (transient-
+   driven only now — see swarm.js's pending-badge derivation comment;
+   there is no separate queued-but-not-running row state to tell apart
+   from this one anymore). */
+.container-row.pending-running .actions { opacity: 0.4; pointer-events: none; }
 .container-row.pending-running {
   border-color: var(--amber);
   background: color-mix(in srgb, var(--amber) 5%, transparent);