feat(web): add live dream progress panel with adaptive polling

Watching dreams was a 5-15min black box. Now a dedicated
/workspaces/:id/queue route polls /v3/workspaces/:id/queue/status
every 2.5s while work is in-flight (10s when idle) and surfaces a
warning when in-progress work hasn't advanced the completed count
for >30 minutes.

The Honcho API only exposes aggregate counts (no observer/observed
pair, specialist phase, or token telemetry per work-unit), so the
panel links out to an upstream issue for those.

- queries: adaptive refetchInterval via TanStack Query callback form
- hooks/useStaleQueueDetection: client-side stall detection
- routes/workspaces_.\$workspaceId_.queue: dedicated live view
- routes/_dev.dream-progress: DEV-only showcase for screenshots
- WorkspaceDetail: new "Queue & dreams" nav card

packages/web/src/components/dashboard/Dashboard.tsx

@@ -209,7 +209,7 @@ export function Dashboard() {
 							<Activity className="w-4 h-4" style={{ color: "var(--accent)" }} strokeWidth={1.5} />
 							<SectionHeading className="mb-0">Queue Status</SectionHeading>
 							<span className="text-xs ml-1" style={{ color: "var(--text-4)" }}>
-								all workspaces · updates every 10s
+								all workspaces · live polling
 							</span>
 						</div>