feat(nav): client area tabs in main navigation

- Add Cabinet button to header (dashboard icon)
- When in /clientarea/* show tabs instead of search input
- Tabs: Заказы | Предложения (SELLER only) | Адреса | Профиль | Команда
- Hide Explore/Quote toggle in client area
- Remove SubNavigation for clientarea (tabs moved to MainNavigation)

app/layouts/topnav.vue

@@ -30,6 +30,7 @@
         :show-active-mode="isCatalogSection"
         :is-collapsed="isHomePage ? heroIsCollapsed : isCatalogSection"
         :is-home-page="isHomePage"
+        :is-client-area="isClientArea"
         @toggle-theme="toggleTheme"
         @set-catalog-mode="setCatalogMode"
         @sign-out="onClickSignOut"
@@ -54,9 +55,9 @@
         </template>
       </MainNavigation>
 
-      <!-- Sub Navigation (section-specific tabs) - only for non-catalog/non-home sections -->
+      <!-- Sub Navigation (section-specific tabs) - only for non-catalog/non-home/non-clientarea sections -->
       <SubNavigation
-        v-if="!isHomePage && !isCatalogSection"
+        v-if="!isHomePage && !isCatalogSection && !isClientArea"
         :section="currentSection"
       />
     </div>
@@ -174,8 +175,13 @@ const isCatalogSection = computed(() => {
          route.path.startsWith('/ru/catalog')
 })
 
+// Client area detection (cabinet tabs in MainNavigation, no SubNav needed)
+const isClientArea = computed(() => {
+  return route.path.includes('/clientarea')
+})
+
 // Collapsible header logic - only for pages with SubNav
-const hasSubNav = computed(() => !isHomePage.value && !isCatalogSection.value)
+const hasSubNav = computed(() => !isHomePage.value && !isCatalogSection.value && !isClientArea.value)
 const canCollapse = computed(() => hasSubNav.value)
 const isHeaderCollapsed = computed(() => canCollapse.value && isCollapsed.value)
 
@@ -193,6 +199,7 @@ const headerContainerStyle = computed(() => {
 const mainStyle = computed(() => {
   if (isCatalogSection.value) return { paddingTop: '0' }
   if (isHomePage.value) return { paddingTop: `${heroBaseHeight.value}px` }
+  if (isClientArea.value) return { paddingTop: '116px' }  // Header only, no SubNav
   return { paddingTop: '154px' }
 })