Description
When using @mentions (e.g. in comments), Wekan currently searches and suggests users only by their username.

For example, if a user’s full name is “John Doe” and their username is “j.doe”, typing @j will still show a suggestion like

John Doe (j.doe)

However, if you type @jo, no result will appear — because only the username is being matched, not the full name.

Expected behavior
When typing an @mention, Wekan should search both the username and the full name fields, so that users can be found even if they remember the person’s name but not their specific username.

Why this is important

• Many organizations use structured or cryptic usernames (e.g. u12345, j.doe, etc.), which users often do not remember.
• Searching by first and/or last name would make mentions much more intuitive and user-friendly.
• It would align Wekan’s behavior with other collaboration tools like Trello, Slack, or GitLab, which all support searching by display name.

Proposed enhancement

Extend the @mention search function to include:

• username (current behavior)
• first name
• last name
• optionally: display name (combined full name)

Environment

Wekan version: 7.93.0

Deployment: Self-hosted installation

Browser: Independent of browser (issue occurs everywhere)