Room Members panel search fails with leading or trailing whitespace

Description:

Searching for members in the Room Members panel fails when the search term contains leading or trailing whitespace.

For example, searching for preeti correctly returns matching members, while searching for preeti or preeti returns no results, even though the search term is otherwise identical.

Steps to reproduce:

1. Open any channel or private group.
2. Open the Members panel.
3. Search for a member using a valid username or display name (e.g. preeti) and verify that the member is returned.
4. Search again using the same term with leading or trailing whitespace (e.g. preeti , preeti, or preeti).

Expected behavior:

Leading and trailing whitespace should be ignored, and the search should return the same results as the trimmed search term.

Actual behavior:

No matching members are returned when the search term contains leading or trailing whitespace.

Screenshot:

https://github.com/user-attachments/assets/a111afb7-8a32-4b88-875b-fbaf1054974d

Server Setup Information:

• Version of Rocket.Chat Server: 8.7.0-develop
• License Type: Community
• Number of Users: N/A
• Operating System: Ubuntu (WSL2)
• Deployment Method: Development
• Number of Running Instances: 1
• DB Replicaset Oplog: N/A
• NodeJS Version: 22.22.1
• MongoDB Version: 7.0.16

Client Setup Information

• Desktop App or Browser Version: Google Chrome
• Operating System: Windows 11

Additional context

The issue is reproducible with both leading and trailing whitespace in the search term. Empty searches continue to work as expected.

Relevant logs:

No relevant server or browser errors were observed.

Locate the Room Members panel and its member-search entry point, then inspect any existing frontend tests for search behavior. Reproduce the issue with leading and trailing spaces, update the search handling so those terms return the same results as the trimmed term, and verify that empty searches still work.