Add AI lab action guardrails

frontend/src/components/detection/DetectionLab.tsx

@@ -89,10 +89,24 @@ export function DetectionLab({
   const detectionHasDataset = selectedDetectionDatasetId.length > 0
   const detectionHasModel = selectedDetectionModel !== null
   const detectionModelReady = Boolean(selectedDetectionModel?.configured)
+  const detectionModelUiRunnable = detectionModelReady && selectedDetectionModelId !== 'manual-fixture-detector'
   const detectionHasTileManifest =
     !detectionRequiresTileManifest || detectionTileManifestPath.trim().length > 0
   const detectionRunReady =
-    Boolean(selectedProjectId) && detectionHasDataset && detectionHasModel && detectionModelReady && detectionHasTileManifest
+    Boolean(selectedProjectId) && detectionHasDataset && detectionHasModel && detectionModelUiRunnable && detectionHasTileManifest
+  const detectionRunBlockedReason = !selectedProjectId
+    ? 'Select or create a project first'
+    : !detectionHasDataset
+      ? 'Select a raster dataset'
+      : !detectionHasModel
+        ? 'Select a detection model'
+        : selectedDetectionModelId === 'manual-fixture-detector'
+          ? 'Fixture model is explicit test/demo-only'
+          : !detectionModelReady
+            ? selectedDetectionModel?.limitation_message ?? 'Selected model is not configured'
+            : !detectionHasTileManifest
+              ? 'Provide a raster tile manifest for configured YOLO'
+              : null
 
   return (
     <section className="workspace-panel ai-lab-shell detection-lab-shell">
@@ -191,6 +205,10 @@ export function DetectionLab({
               </div>
             </div>
           </div>
+          <div className={detectionRunReady ? 'lab-action-guardrail lab-action-guardrail-ready' : 'lab-action-guardrail'}>
+            <span>Run action</span>
+            <strong>{detectionRunReady ? 'Ready to submit a detection job' : detectionRunBlockedReason}</strong>
+          </div>
           {rasterDatasets.length === 0 ? (
             <div className="result-state result-state-empty">
               <strong>No raster datasets available for detection.</strong>
@@ -242,7 +260,7 @@ export function DetectionLab({
               />
             </label>
           ) : null}
-          <button className="primary-action" type="button" onClick={onRunDetection} disabled={runningDetection || !selectedProjectId || rasterDatasets.length === 0}>
+          <button className="primary-action" type="button" onClick={onRunDetection} disabled={runningDetection || !detectionRunReady}>
             Run detection
           </button>
         </div>