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/WorkspaceSwitcher.vue

@@ -23,7 +23,7 @@ import type { Organisation } from '@/types/auth'
 
 defineProps<{
   /**
-   * When true (collapsed sidebar), hide the name/sub meta text and
+   * When true (collapsed sidebar), hide the name meta text and
    * show only the logo square — mirrors crewli-starter's collapsed prop.
    */
   collapsed?: boolean
@@ -43,8 +43,6 @@ interface WorkspaceDisplay {
   id: string
   initials: string
   name: string
-  /** The role string is the relevant context identifier in Crewli. */
-  sub: string
   gradient: [string, string]
 }
 
@@ -60,7 +58,6 @@ function buildDisplay(org: Organisation): WorkspaceDisplay {
     id: org.id,
     initials,
     name: org.name,
-    sub: org.role,
     gradient: computeOrgGradient(org.id),
   }
 }
@@ -129,7 +126,7 @@ function selectOrg(ws: WorkspaceDisplay): void {
         {{ current.initials }}
       </span>
 
-      <!-- Meta: name + sub (hidden in collapsed mode) -->
+      <!-- Meta: name (hidden in collapsed mode) -->
       <!-- .ws-switcher .meta: flex-1, min-w-0, flex-col, line-height, text-left -->
       <span
         v-if="!collapsed && current"
@@ -139,10 +136,6 @@ function selectOrg(ws: WorkspaceDisplay): void {
         <span class="truncate text-[13.5px] font-semibold text-[var(--p-text-color)]">
           {{ current.name }}
         </span>
-        <!-- .ws-switcher .meta .sub: text-[11.5px], muted, truncate -->
-        <span class="truncate text-[11.5px] text-[var(--p-text-muted-color)]">
-          {{ current.sub }}
-        </span>
       </span>
 
       <!-- Chevron (.ws-switcher .chev: color fg-subtle, flex-shrink-0) -->
@@ -185,12 +178,10 @@ function selectOrg(ws: WorkspaceDisplay): void {
             :style="{ background: `linear-gradient(135deg, ${ws.gradient[0]}, ${ws.gradient[1]})` }"
           >{{ ws.initials }}</span>
 
-          <!-- Name + sub stack -->
+          <!-- Name -->
           <span>
             <!-- .pop-ws .opt .name -->
             <div class="text-[14px] font-semibold text-[var(--p-text-color)]">{{ ws.name }}</div>
-            <!-- .pop-ws .opt .sub -->
-            <div class="mt-[2px] text-[12.5px] text-[var(--p-text-muted-color)]">{{ ws.sub }}</div>
           </span>
 
           <!-- Check mark for active org (.pop-ws .opt .check-mark) -->