fix: group mobile drawer sections, drop the bottom-pinned void

In the mobile drawer the nav's flex-1 filled the full-height panel, pushing
the WorkspaceSwitcher to the very bottom and leaving a large empty void between
the menu and the switcher. Add a 'grow' prop to SidebarNav (default true =
desktop bottom-anchor) and pass grow=false in the mobile drawer so the nav
takes only its natural height — logo, menu and switcher group together at the
top. Desktop sidebar unchanged. +2 Vitest assertions for the contract.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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

@@ -165,7 +165,10 @@ const mobileVisible = computed<boolean>({
     }"
   >
     <SidebarHeader />
-    <SidebarNav :collapsed="false" />
+    <SidebarNav
+      :collapsed="false"
+      :grow="false"
+    />
     <WorkspaceSwitcher :collapsed="false" />
   </Drawer>
 </template>

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

@@ -22,9 +22,21 @@ import type { RouteLocationRaw } from 'unplugin-vue-router'
 import Icon from '@/components/Icon.vue'
 import { APP_NAVIGATION, type NavItem } from '@/config/navigation'
 
-defineProps<{
+withDefaults(defineProps<{
   collapsed: boolean
-}>()
+  /**
+   * When true (default), the nav fills available vertical space (`flex-1`)
+   * so a bottom-anchored sibling (WorkspaceSwitcher) pins to the bottom — the
+   * desktop sidebar behaviour. Set false in the mobile drawer (`flex-initial`)
+   * so the nav takes its natural height — logo + menu + switcher group together
+   * at the top instead of leaving a void above a bottom-pinned switcher
+   * (MOBILE-SHELL-PARITY follow-up). `flex-initial` (not `flex-none`) keeps
+   * `flex-shrink: 1`, so if the menu ever grows past the panel height the nav
+   * shrinks and scrolls internally (`min-h-0 overflow-y-auto`) rather than
+   * pushing the switcher out of the `overflow-hidden` drawer content.
+   */
+  grow?: boolean
+}>(), { grow: true })
 
 const route = useRoute()
 
@@ -52,7 +64,10 @@ function itemTo(item: NavItem): RouteLocationRaw {
 </script>
 
 <template>
-  <nav class="flex-1 min-h-0 overflow-y-auto py-3.5 px-2.5 [scrollbar-width:thin]">
+  <nav
+    class="min-h-0 overflow-y-auto py-3.5 px-2.5 [scrollbar-width:thin]"
+    :class="grow ? 'flex-1' : 'flex-initial'"
+  >
     <template
       v-for="topItem in APP_NAVIGATION"
       :key="topItem.key"

apps/app/src/components-v2/layout/__tests__/AppSidebar.spec.ts

@@ -66,8 +66,8 @@ const globalStubs = {
   SidebarHeader: { name: 'SidebarHeader', template: '<div class="sidebar-header-stub" />' },
   SidebarNav: {
     name: 'SidebarNav',
-    props: ['collapsed'],
-    template: '<div class="sidebar-nav-stub" :data-collapsed="collapsed" />',
+    props: ['collapsed', 'grow'],
+    template: '<div class="sidebar-nav-stub" :data-collapsed="collapsed" :data-grow="grow" />',
   },
   WorkspaceSwitcher: {
     name: 'WorkspaceSwitcher',
@@ -203,6 +203,35 @@ describe('AppSidebar', () => {
     expect(drawer.find('.workspace-switcher-stub').exists()).toBe(true)
   })
 
+  it('mobile: SidebarNav is told NOT to grow (grow=false) so logo/menu/switcher group at the top', async () => {
+    mockIsMobileRef.value = true
+
+    const wrapper = mountSidebar()
+
+    await wrapper.vm.$nextTick()
+
+    // grow=false → nav takes natural height, no flex-1 fill → no void above a
+    // bottom-pinned WorkspaceSwitcher (they group together at the top instead).
+    const navInDrawer = wrapper.find('.drawer-stub').find('.sidebar-nav-stub')
+
+    expect(navInDrawer.attributes('data-grow')).toBe('false')
+  })
+
+  it('desktop: SidebarNav is allowed to grow (WorkspaceSwitcher stays bottom-anchored)', async () => {
+    mockIsMobileRef.value = false
+
+    const wrapper = mountSidebar()
+
+    await wrapper.vm.$nextTick()
+
+    // The desktop <aside> passes no grow prop → defaults to true (flex-1),
+    // keeping the switcher pinned at the bottom. The stub does not apply the
+    // component default, so we assert grow is NOT explicitly false here.
+    const navInAside = wrapper.find('aside').find('.sidebar-nav-stub')
+
+    expect(navInAside.attributes('data-grow')).not.toBe('false')
+  })
+
   // -------------------------------------------------------------------------
   // Desktop <aside> width class based on sidebarCollapsed
   // -------------------------------------------------------------------------