Polish workflow rail context navigation

frontend/README.md

@@ -250,6 +250,7 @@ Detection Lab and Segmentation Lab now share the same AI workspace hierarchy: mo
 - The Overview workspace separates readiness, status tiles and recommended next actions into distinct visual hierarchy regions, keeping the first screen scannable without changing workflow behavior.
 - The Overview workspace now also shows a compact workflow guidance rail for the V1 path from project and AOI setup through data, map review, QA/AI validation and export handoff.
 - When the V1 workflow is populated end to end, the Overview rail switches to a `Ready for handoff` state and keeps map guidance explicit about layer features versus AOI context.
+- Overview rail Map and Export clicks reuse the first ready vector/GeoJSON dataset when no layer or dataset is active, keeping the happy path connected without adding new API calls.
 - The Data workspace surfaces selected project, AOI and dataset context before creation/upload forms, then separates form and catalog/list regions for faster scanning.
 - The Export Center includes a handoff readiness summary, grouped artifact actions and provenance-rich export cards so report/GeoJSON handoff stays understandable in long-running demo projects.
 

frontend/src/App.tsx

@@ -449,6 +449,17 @@ function App(): JSX.Element {
     }
     setActiveWorkspace('exports')
   }
+  const openWorkflowGuidanceStep = (target: WorkspaceKey) => {
+    if (target === 'map' && availableMapDatasets.length > 0 && !mapFeatureCollection) {
+      openDatasetInMap(availableMapDatasets[0])
+      return
+    }
+    if (target === 'exports' && availableMapDatasets.length > 0 && !selectedDataset) {
+      openDatasetExport(availableMapDatasets[0])
+      return
+    }
+    setActiveWorkspace(target)
+  }
   const hasAnalysisOutput = qualityChecks.length > 0 || Boolean(changeDetectionResult) || detectionItems.length > 0 || segmentationItems.length > 0
   const hasMapContext = mapFeatureCount > 0 || areaFeatureCount > 0
   const workflowGuidanceComplete = Boolean(selectedProjectId) && datasets.length > 0 && hasMapContext && hasAnalysisOutput && exports.length > 0
@@ -630,7 +641,7 @@ function App(): JSX.Element {
                             ? 'workflow-guidance-step workflow-guidance-step-ready'
                             : 'workflow-guidance-step'
                       }
-                      onClick={() => setActiveWorkspace(step.target)}
+                      onClick={() => openWorkflowGuidanceStep(step.target)}
                       aria-label={`Open ${step.title} step`}
                     >
                       <span className="workflow-step-status">{step.status}</span>