Replaces the Plan-1 skeleton stubs: OrganizerLayoutV2 now fills
AppShellV2's #sidebar/#topbar/#drawer slots with the ported AppSidebar /
AppTopbar / RightDrawer and sources orgNavItems via useV2Nav() (legal
now that OrganizerLayoutV2.vue is the layouts-v2 zone). AppShellV2 is
unchanged; its contract test stays green. New component test locks the
composition (right component per slot, :groups forwarded, no skeleton).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
