Give the traceback button its width back

Reserving a slot for all three status controls left 72px for a node's title,
against about 140px before. Only the stop button and the dot come and go on
their own; the traceback button appears when a node newly fails and goes when
someone acknowledges it, which is a thing to notice rather than a flicker. It
goes back in the row, and the title gets 106px.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016ZeGnqVsf5VHQqvz4HdUhN

frontend/src/components/Flow/FlowNode.tsx

@@ -226,11 +226,14 @@ function FlowNodeComponent({ data, selected }: NodeProps) {
               {typeLabel}
             </span>
           </span>
-          {/* Each control sits in a slot that is there whether the control
+          {/* This and the dot below sit in slots that are there whether the
-              is or not. They come and go with what the node is doing — and a
+              control is or not: both come and go on their own — a node running
-              node running many times a second comes and goes that often — so
+              many times a second mounts and unmounts this on every execution —
-              in the flex row itself they would resize the card on every
+              and in the flex row itself that resizes the card each time, which
-              execution, which reads as a flickering shape. */}
+              reads as a flickering shape. The traceback button below is left
+              in the row on purpose: it appears when a node newly fails and
+              goes when someone acknowledges it, which is a thing to notice
+              rather than a flicker, and a slot for it costs the title 34px. */}
           <span className="flex size-6 shrink-0 items-center justify-center">
             {running ? (
               <Tooltip>
@@ -259,7 +262,6 @@ function FlowNodeComponent({ data, selected }: NodeProps) {
             ) : null}
           </span>
 
-          <span className="flex size-6 shrink-0 items-center justify-center">
           {(status === "error" || failedEarlier) && onShowLogs ? (
             <Tooltip>
               <TooltipTrigger asChild>
@@ -300,7 +302,6 @@ function FlowNodeComponent({ data, selected }: NodeProps) {
               </TooltipContent>
             </Tooltip>
           ) : null}
-          </span>
 
           <span className="flex size-2 shrink-0 items-center justify-center">
             {style ? (