F7: tighten status-refresh cadence 30s->10s (dashboard state lag)

The dashboard stacks list served the in-memory map refreshed by a 30s ticker, so
container state lagged Docker health by up to ~30s after a deploy. RefreshStatus
is a cheap docker-ps refresh; 10s (matching health-probes) cuts the lag without
loading Docker.

controller/cmd/controller/main.go

@@ -253,7 +253,11 @@ func main() {
 	sched.SetDebug(cfg.Logging.Level == "debug")
 
 	// Existing periodic tasks (migrated from ad-hoc goroutines)
-	sched.Every("status-refresh", 30*time.Second, func(ctx context.Context) error {
+	// F7: 30s left the dashboard list lagging Docker health by up to ~30s after a deploy/state change.
+	// 10s (matching the health-probes cadence) tightens it; RefreshStatus is a cheap `docker ps`-based
+	// refresh of the in-memory map, so 10s does not meaningfully load Docker. (The deploy page itself
+	// already polls per-stack every 3s; this is for the dashboard/stacks list.)
+	sched.Every("status-refresh", 10*time.Second, func(ctx context.Context) error {
 		return stackMgr.RefreshStatus()
 	})
 	sched.Every("stack-scan", 2*time.Minute, func(ctx context.Context) error {