Add batch upload configure modal and settings mapping utilities.

Users configure share mode, expiry, and max views before upload; batch summary confirms choices above the queue.

frontend/src/utils/upload/resolveUploadBatchMaxViews.ts

@@ -0,0 +1,9 @@
+import type { UploadMaxViewsPreset } from '@/types/upload/UploadMaxViewsPreset';
+
+export const resolveUploadBatchMaxViews = (preset: UploadMaxViewsPreset): number | null => {
+    if (preset === 'unlimited') {
+        return null;
+    }
+
+    return parseInt(preset, 10);
+};