make the hackathon on by default

ui/src/components/HFJobsWorkflow.tsx

@@ -152,7 +152,8 @@ export default function HFJobsWorkflow({ jobConfig, onComplete, hackathonEligibl
   const [hardware, setHardware] = useState(settings.HF_JOBS_DEFAULT_HARDWARE || 'a100-large');
   const [namespace, setNamespace] = useState(settings.HF_JOBS_NAMESPACE || '');
   const [autoUpload, setAutoUpload] = useState(true);
-  const [participateHackathon, setParticipateHackathon] = useState(false);
+  const [participateHackathon, setParticipateHackathon] = useState(() => hackathonEligible);
+  const [participationTouched, setParticipationTouched] = useState(false);
 
   const requiresControlImages = (() => {
     try {
@@ -163,6 +164,14 @@ export default function HFJobsWorkflow({ jobConfig, onComplete, hackathonEligibl
     }
   })();
 
+  const samplingDisabled = (() => {
+    try {
+      return Boolean(jobConfig?.config?.process?.[0]?.train?.disable_sampling);
+    } catch (error) {
+      return false;
+    }
+  })();
+
   const hasControlDataset = (() => {
     try {
       const datasets = jobConfig?.config?.process?.[0]?.datasets ?? [];
@@ -179,10 +188,17 @@ export default function HFJobsWorkflow({ jobConfig, onComplete, hackathonEligibl
   })();
 
   useEffect(() => {
-    if (!hackathonEligible && participateHackathon) {
-      setParticipateHackathon(false);
+    if (!hackathonEligible) {
+      if (participateHackathon) {
+        setParticipateHackathon(false);
+      }
+      if (participationTouched) {
+        setParticipationTouched(false);
+      }
+    } else if (!participateHackathon && !participationTouched) {
+      setParticipateHackathon(true);
     }
-  }, [hackathonEligible, participateHackathon]);
+  }, [hackathonEligible, participateHackathon, participationTouched]);
   
   // Progress state
   const [validationResult, setValidationResult] = useState<any>(null);
@@ -330,12 +346,14 @@ export default function HFJobsWorkflow({ jobConfig, onComplete, hackathonEligibl
           return;
         }
 
-        const samples = jobConfig?.config?.process?.[0]?.sample?.samples ?? [];
-        const missingCtrl = samples.filter((sample: any) => !sample?.ctrl_img || !String(sample.ctrl_img).trim());
-        if (missingCtrl.length > 0) {
-          setError('Instruction models require a control image for every sample prompt. Please add control images before submitting.');
-          setLoading(false);
-          return;
+        if (!samplingDisabled) {
+          const samples = jobConfig?.config?.process?.[0]?.sample?.samples ?? [];
+          const missingCtrl = samples.filter((sample: any) => !sample?.ctrl_img || !String(sample.ctrl_img).trim());
+          if (missingCtrl.length > 0) {
+            setError('Instruction models require a control image for every sample prompt. Please add control images before submitting.');
+            setLoading(false);
+            return;
+          }
         }
       }
 
@@ -456,7 +474,10 @@ export default function HFJobsWorkflow({ jobConfig, onComplete, hackathonEligibl
                     </span>
                   }
                   checked={participateHackathon}
-                  onChange={value => setParticipateHackathon(value)}
+                  onChange={value => {
+                    setParticipationTouched(true);
+                    setParticipateHackathon(value);
+                  }}
                 />
               )}
               <p className="text-sm text-gray-400">