use batch get event donors by id

[PCBZ]

No description provided.

[Copilot]

Pull Request Overview

This PR implements a batch retrieval mechanism for event donor data by ID to improve performance and consistency. Key changes include:

• Updating the donor export service to fetch donor IDs first and then retrieve donor data in one batch.
• Adding new server endpoints: one for obtaining donor IDs for an event and another for fetching donor data in batch.
• Minor UI refinement in the donors component to trim organization names before display.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
client/src/services/donorService.js	Refactored exportEventDonorsToCsv to use batch donor fetching via a new helper.
client/src/components/donors/Donors.jsx	Updated organization name rendering to trim whitespace before display.
Server/src/routes/event.js	Added a new GET endpoint to retrieve donor IDs for a given event.
Server/src/routes/donor.js	Added a new POST endpoint to fetch donors in batch based on provided donor IDs.

[Copilot]

[nitpick] Consider handling the case where the organization name consists only of whitespace. If the trimmed value is an empty string, you might want to provide a fallback or avoid rendering the element.

Suggested change

	{((selectedDonor.donor?.organizationName || selectedDonor.organizationName)?.trim()) && (
	{((selectedDonor.donor?.organizationName || selectedDonor.organizationName)?.trim().length > 0) && (

[Copilot]

Ensure that fetchWithAuth includes the appropriate 'Content-Type': 'application/json' header for POST requests so that the JSON payload is processed correctly by the server.

Suggested change

	method: 'POST',
	method: 'POST',
	headers: {
	'Content-Type': 'application/json'
	},