Space member lists change their order on every load #3922

Initial Checklist

• I understand this is a bug report and questions should be posted in the Community Discussions
• I searched issues and couldn’t find anything (or linked relevant results below)

Bug Description

The server returns space members in a different order on every request, and the member lists only sort by role, so members change places on every load and move between pages:

• Spaces overview ("Show members"), space sidebar and the space members section of the file share panel: sortSpaceMembers in web-pkg/src/composables/piniaStores/spaces.ts:23-25 sorts by permissions.length only.
• Admin settings > Spaces > Members: sortedPermissions in web-app-admin-settings/src/components/Spaces/SideBar/MembersPanel.vue groups by role only.

Fix: add a secondary sort by display name in both places.

Reproduction Steps

1. Add several members with the same role to a project space.
2. Open the members panel in the Spaces overview, close it and open it again (or reload).
3. Do the same in Admin settings > Spaces.

Expected Outcome

A stable order within each role, e.g. alphabetical.

Actual Outcome

The order changes on every load; with more than one page, members jump between pages.