Put resources where somebody would look for them

`resources` was reachable from the SDK and the API and nowhere else, and
`node_queued` was published to nothing at all — so a node waiting for a machine
looked exactly like a node that had hung, which is the failure the event was
added for.

The node panel gets a Resources section: a size by name, the numbers for a node
that wants its own, and how long it is expected to take. Picking a flavor drops
the numbers, because saying both is two answers and the engine refuses it.

A queued node draws a neutral dot rather than one of the three status colours —
it is not running, it did not go well, and it did not go wrong; it is idle with
a reason, which the tooltip gives.

And a Workers screen, which is the first UI for any of this: every machine the
engine can reach with what is free of each, what is attached, what a cluster
has been asked for, and the sizes, editable. `fluksio status` grew a line of
the same.

The demo's training node already preferred a GPU worker, which was exactly the
declaration that used to be dropped, so it now says how much of that machine it
takes as well.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A6HeySA27EkGANZN95QySW

frontend/src/components/Flow/useFlowSocket.ts

@@ -42,6 +42,14 @@ type FlowEvent =
       source?: ValueSource
     }
   | { type: "node_started"; node: string }
+  | {
+      type: "node_queued"
+      flow?: string
+      node: string
+      run?: string
+      detail?: string
+      ts?: number
+    }
   | {
       type: "node_executed"
       flow?: string
@@ -179,6 +187,14 @@ function connect() {
           source: message.source,
         })
         break
+      case "node_queued":
+        // Waiting for a machine, which looks exactly like hung from outside.
+        // `node_started` overwrites this, so nothing has to clear it.
+        liveStore.setStatus(message.node, {
+          status: "queued",
+          detail: message.detail,
+        })
+        break
       case "node_started":
         liveStore.setStatus(message.node, { status: "running" })
         break