feat(layout): Plan 2.5 P4 — WorkspaceSwitcher no-sub + SidebarNav APP_NAVIGATION

Per RFC-WS-PRIMEVUE-PLAN-2-5 §4 AD-2.5-W1 and AD-2.5-B1, §5.4 Fix 4.

Changes:
- WorkspaceSwitcher: sub field removed from template, WorkspaceDisplay
  type, and buildDisplay derivation. Stories did not carry sub args
  (auto-derived from seeded org.role); no WithSub story existed. New
  regression spec (WorkspaceSwitcher.spec.ts) locks the no-sub render.
- SidebarNav: now consumes APP_NAVIGATION from src/config/navigation.ts
  as the single source of truth (shared with breadcrumb derivation in
  useNavBreadcrumb). The groups: V2NavGroup[] prop is removed; render
  walks top-level NavItems (branch nodes render label-heading + children;
  leaf nodes render as rows; items without routeName render as
  non-clickable dormant placeholders). Previous nav data source:
  groups prop fed by useV2Nav(orgNavItems) in OrganizerLayoutV2.
- APP_NAVIGATION expanded with 7 entries to preserve visual sidebar
  continuity (Evenementen at top-level + Beheer branch with 5 children).
  All new entries use routeName: undefined until the corresponding v2
  page lands (TODOs noted per entry); only Dashboard maps to v2-dashboard.
- AppSidebar: groups prop removed; passes only :collapsed to SidebarNav.
- OrganizerLayoutV2: useV2Nav(orgNavItems) plumbing retired; the layout
  now renders <AppSidebar /> with no nav-data wiring.
- Tests: AppSidebar.spec drops the "passes groups prop to SidebarNav"
  assertion; OrganizerLayoutV2.spec drops the "forwards orgNavItems"
  assertion. New WorkspaceSwitcher no-sub regression spec (+2 tests).
- Storybook: SidebarNav.stories and AppSidebar.stories updated to no
  longer thread navFixture/groups; WithActiveItem pushes v2-dashboard.

Position of WorkspaceSwitcher (Fix 3), workspace dropdown panel (Fix 5),
and AppBreadcrumb wiring (Fix 2) remain unchanged in P4 — both lands in
P5. The legacy useBreadcrumb composable also remains untouched until P5
(atomic with AppTopbar refactor).

Orphans flagged for follow-up cleanup (intentionally not deleted in P4):
useV2Nav composable + spec, V2NavGroup/V2NavItem types, sidebarNavActive
helper + spec, navFixture in stories/v2/_helpers.ts.

Suite delta: 575 → 575 (+2 WorkspaceSwitcher no-sub spec, -1 AppSidebar
groups-prop assertion, -1 OrganizerLayoutV2 groups-forward assertion).
vue-tsc clean. Scoped ESLint clean (0 errors).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/app/src/components-v2/layout/AppSidebar.vue

@@ -19,8 +19,11 @@
  *     teleported overlay. By unmounting on desktop we guarantee no modal backdrop /
  *     focus-trapped dialog can appear on wide viewports regardless of mobileOpen state.
  *
- * nav groups arrive as a prop — this file must NOT import @/navigation directly
- * (components-v2 import boundary; the layout page supplies nav data).
+ * Nav data: as of Plan 2.5 P4, SidebarNav reads APP_NAVIGATION from
+ * @/config/navigation directly — no prop is threaded through AppSidebar.
+ * The components-v2 import boundary still applies to @/navigation (the v1
+ * source), but @/config/navigation is the unclassified central registry
+ * and is consumed in-place by SidebarNav.
  *
  * Deliberate simplification: crewli-starter's bespoke Teleport tooltip (shown in
  * collapsed mode for nav items) is NOT ported here. SidebarNav already provides
@@ -41,19 +44,10 @@ import { computed } from 'vue'
 import { breakpointsTailwind, useBreakpoints } from '@vueuse/core'
 import Drawer from 'primevue/drawer'
 import { useShellUiStore } from '@/stores/useShellUiStore'
-import type { V2NavGroup } from '@/types/v2/nav'
 import SidebarHeader from '@/components-v2/layout/SidebarHeader.vue'
 import SidebarNav from '@/components-v2/layout/SidebarNav.vue'
 import WorkspaceSwitcher from '@/components-v2/layout/WorkspaceSwitcher.vue'
 
-defineProps<{
-  /**
-   * Nav groups passed in from the layout — components-v2 files may NOT
-   * import from @/navigation; the parent layout supplies this.
-   */
-  groups: V2NavGroup[]
-}>()
-
 const shell = useShellUiStore()
 
 // Shared breakpoint signal — must match SidebarHeader and the CSS `lg:` boundary (1024px).
@@ -84,10 +78,7 @@ const mobileVisible = computed<boolean>({
     :class="shell.sidebarCollapsed ? 'w-16' : 'w-64'"
   >
     <SidebarHeader />
-    <SidebarNav
-      :groups="groups"
-      :collapsed="shell.sidebarCollapsed"
-    />
+    <SidebarNav :collapsed="shell.sidebarCollapsed" />
     <WorkspaceSwitcher :collapsed="shell.sidebarCollapsed" />
   </aside>
 
@@ -119,10 +110,7 @@ const mobileVisible = computed<boolean>({
     }"
   >
     <SidebarHeader />
-    <SidebarNav
-      :groups="groups"
-      :collapsed="false"
-    />
+    <SidebarNav :collapsed="false" />
     <WorkspaceSwitcher :collapsed="false" />
   </Drawer>
 </template>