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/buildZkUploadPrepareOptionsFromBatchSettings.ts

@@ -0,0 +1,39 @@
+import type { UploadBatchSettingsForm } from '@/types/upload/UploadBatchSettingsForm';
+import type { ZkUploadPrepareOptionsResult } from '@/types/upload/ZkUploadPrepareOptionsResult';
+import { resolveUploadBatchExpiresAt } from '@/utils/upload/resolveUploadBatchExpiresAt';
+import { resolveUploadBatchMaxViews } from '@/utils/upload/resolveUploadBatchMaxViews';
+import { validateUploadBatchSettings } from '@/utils/upload/validateUploadBatchSettings';
+
+export const buildZkUploadPrepareOptionsFromBatchSettings = (
+    settings: UploadBatchSettingsForm
+): ZkUploadPrepareOptionsResult => {
+    const validationError = validateUploadBatchSettings(settings);
+
+    if (validationError) {
+        return { ok: false, error: validationError };
+    }
+
+    const uploadOptions = {
+        expiresAt: resolveUploadBatchExpiresAt(settings.expiryPreset),
+        maxViews: resolveUploadBatchMaxViews(settings.maxViewsPreset)
+    };
+
+    if (settings.passwordEnabled) {
+        return {
+            ok: true,
+            options: {
+                ...uploadOptions,
+                passwordProtected: true,
+                password: settings.password
+            }
+        };
+    }
+
+    return {
+        ok: true,
+        options: {
+            ...uploadOptions,
+            passwordProtected: false
+        }
+    };
+};