fix(frontend): implement robust file signature comparison for Scriptorium reset

Author: whynotkimhari

src/frontend/app/scriptorium/page.tsx

@@ -143,11 +143,12 @@ export default function Home() {
   // Reset job results if files change *after* a previous run is finished
   useEffect(() => {
     if (currentJobId && !loading) {
-      const currentFileNames = files.map(f => f.name).sort();
-      const lastRunFileNames = [...lastRunFilesRef.current].sort();
+      const getFileSignature = (f: File) => `${f.name}:${f.size}:${f.lastModified}`;
+      const currentSignatures = files.map(getFileSignature).sort();
+      const lastRunSignatures = [...lastRunFilesRef.current].sort();
       const filesHaveChanged =
-        currentFileNames.length !== lastRunFileNames.length ||
-        !currentFileNames.every((name, i) => name === lastRunFileNames[i]);
+        currentSignatures.length !== lastRunSignatures.length ||
+        !currentSignatures.every((sig, i) => sig === lastRunSignatures[i]);
 
       // If we have a finished job (completed/failed/cancelled), clear it *only* when the files actually change
       if (['completed', 'failed', 'cancelled'].includes(batchJob?.status || '') && filesHaveChanged) {
@@ -381,7 +382,7 @@ export default function Home() {
       }
 
       const data = await res.json();
-      lastRunFilesRef.current = files.map(f => f.name);
+      lastRunFilesRef.current = files.map(f => `${f.name}:${f.size}:${f.lastModified}`);
       setCurrentJobId(data.job_id);
       setPollingJobId(data.job_id); // Start polling
 
@@ -439,7 +440,7 @@ export default function Home() {
       }
 
       const { job_id } = await startRes.json();
-      lastRunFilesRef.current = files.map(f => f.name);
+      lastRunFilesRef.current = files.map(f => `${f.name}:${f.size}:${f.lastModified}`);
       setCurrentJobId(job_id);
       setPollingJobId(job_id); // DB polling fallback (works even if SSE disconnects)