[Due for payment 2026-05-29] Add ExportDownload Onyx foundation and shared export action functions

[mollfpr]

Context

Shared foundation for the Bulk Report PDF Export and Improve Report Export
Realtime Delivery projects. No user-visible changes — nothing renders yet.

Changes

src/types/onyx/ExportDownload.ts (new file)

• Discriminated union type. reportCount and failedReportCount are optional
  even in the ready state — present for PDF exports, absent for CSV exports

src/CONST/index.ts

• Add EXPORT_DOWNLOAD: { STATE: { PREPARING, READY, FAILED } } constants

src/ONYXKEYS.ts

• Add EXPORT_DOWNLOAD: 'nvp_exportDownload_' to the COLLECTION object
• Map to OnyxTypes.ExportDownload in OnyxCollectionValuesMapping

src/libs/API/types.ts

• Add SEND_EXPORT_FILE_FROM_CONCIERGE and CLEAR_EXPORT_DOWNLOAD to
  WRITE_COMMANDS
• Add SendExportFileFromConciergeParams and ClearExportDownloadParams,
  each with {exportID: string}
• Map them in WriteCommandParameters

src/libs/actions/Export.ts (new file)

• sendExportFileFromConcierge(exportID) — optimistically merges
  {shouldSendFromConcierge: true}, calls
  API.write(SEND_EXPORT_FILE_FROM_CONCIERGE, {exportID})
• clearExportDownload(exportID) — optimistically sets Onyx key to null,
  calls API.write(CLEAR_EXPORT_DOWNLOAD, {exportID})
• clearStaleExportDownloads() — iterates
  ONYXKEYS.COLLECTION.EXPORT_DOWNLOAD and calls clearExportDownload
  for each entry found

src/libs/Navigation/AppNavigator/AuthScreensInitHandler.tsx

• Call Export.clearStaleExportDownloads() alongside existing
  Download.clearDownloads()

Testing

Unit tests in tests/unit/ExportActionsTest.ts:

• sendExportFileFromConcierge merges {shouldSendFromConcierge: true} into
  the correct Onyx key
• sendExportFileFromConcierge failureData clears Onyx key
• clearExportDownload sets Onyx key to null
• clearStaleExportDownloads calls clearExportDownload for each non-null
  entry in the collection

Issue Owner

Current Issue Owner: @truph01

[mollfpr]

@daledah as reviewer and @truph01 will implementing 🙌

[truph01]

I’m working on the PR. It should be ready for review EOD.