Vikunja: WebSocket authentication ignores server-side session state, so revoked sessions keep receiving live pushes

Summary Vikunja v2.6.0 introduced server-side sessions with revocation semantics: DELETE /api/v2/user/sessions/id documents "Revokes a specific session by its UUID", and enabling TOTP calls DeleteAllUserSessions to invalidate all sessions. The WebSocket endpoint accepts any cryptographically vali...