gui-ts: prevent stale run overwrites and expose model mismatch

Guard async solve updates with run tokens and surface FDM/FEA card length mismatch in Results so users understand when overlays are intentionally reduced.

Made-with: Cursor

gui-ts/src/ui/tabs/ResultsTab.tsx

@@ -122,6 +122,12 @@ export function ResultsTab({
     }
     return [fdmSeries.position, fdmSeries.polished, fdmSeries.downhole] as AlignedData;
   }, [fdm, fea]);
+  const hasCardLengthMismatch = useMemo(() => {
+    const fdmSeries = toSeries(fdm ?? undefined);
+    const feaSeries = toSeries(fea ?? undefined);
+    if (!fdmSeries || !feaSeries) return false;
+    return fdmSeries.position.length !== feaSeries.position.length;
+  }, [fdm, fea]);
 
   const dynacardOptions = useMemo<Options>(() => {
     const seriesCount = fea ? 5 : 3;
@@ -364,6 +370,11 @@ export function ResultsTab({
           </Fieldset>
 
           <Fieldset legend="Dynamometer Card">
+            {hasCardLengthMismatch && (
+              <div className="callout">
+                FDM and FEA card lengths differ; chart overlay is limited to FDM series for this run.
+              </div>
+            )}
             {dynacardData ? (
               <UPlotChart data={dynacardData} options={dynacardOptions} height={340} />
             ) : (