feat: add duration field to dataset entries and update related components for display and processing

src/app/actions/download-filtered-entries.ts

@@ -66,7 +66,7 @@ export async function downloadFilteredEntries(
     const row = [
       `"${entry.externalId}"`,
       entry.fileName,
-      '',
+      entry.durationMs?.toString() || '',
       entry.utteranceId || '',
       `"${(entry.utteranceText || '').replace(/"/g, '""')}"`,
       entry.speakerId,

src/app/actions/upload.ts

@@ -136,6 +136,7 @@ export async function processDatasetEntries(
           fileName: relativePath,
           dialect: row.dialect,
           iteration: parseInt(row.iteration, 10),
+          durationMs: row.duration_ms ? parseInt(row.duration_ms, 10) : undefined,
         });
       }
     }