fix(frontend): ParticipantList session roles are mocked

[mrveiss]

Problem

ParticipantList cannot display or manage real session participant roles - all data is hardcoded as 'owner' or 'collaborator'.

Root Cause

Lines 52+ use computed property that mocks role data instead of fetching from session API:

const participantsWithRoles = computed<ParticipantWithRole[]>(() => {
  return sessionPresence.value.map(p => ({
    ...p,
    role: p.userId === myPresence.value?.userId ? 'owner' : 'collaborator' as const,
    // Placeholder email and joinedAt - NOT from session API
  }))
})

Impact

• Cannot manage real session permissions
• Cannot assign/revoke participant roles
• Blocking feature for collaborative sessions

Files

• autobot-frontend/src/components/collaboration/ParticipantList.vue

Solution

Fetch real role and permission data from session API endpoint