feat(app): keep all views alive after first visit, preserve scroll state

All route views now mount once and hide via CSS (.view-hidden) instead of
unmounting. Tenant pages wrapped in .page-scroll divs for scrollability.
Only LoginView stays in RouterView (no state to preserve).
TestsView updated to use active ref in provideToolbar.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/App.vue

@@ -12,11 +12,21 @@
                 <AppToolbar />
                 <div class="content-area">
                     <TtsPlayerBar />
-                    <!-- Socket views: v-if=visited (lazy first mount), class-based hide (preserve scroll) -->
+                    <!-- All views kept alive after first visit — CSS hide preserves scroll/state -->
                     <AgentsView v-if="visited.nyx" :class="{ 'view-hidden': route.name !== 'nyx' }" />
                     <ViewerView v-if="ViewerView && visited.viewer" :class="{ 'view-hidden': route.name !== 'viewer' }" />
-                    <!-- Non-socket views: scrollable -->
+                    <TestsView v-if="visited.tests" :class="{ 'view-hidden': route.name !== 'tests' }" />
-                    <div v-if="routerReady && !isSocketRoute" class="page-scroll">
+                    <div v-if="visited.home" :class="['page-scroll', { 'view-hidden': route.name !== 'home' }]">
+                        <component :is="HomePageAsync" />
+                    </div>
+                    <div v-if="visited.impressum" :class="['page-scroll', { 'view-hidden': route.name !== 'impressum' }]">
+                        <component :is="ImpressumPageAsync" />
+                    </div>
+                    <div v-if="visited.datenschutz" :class="['page-scroll', { 'view-hidden': route.name !== 'datenschutz' }]">
+                        <component :is="DatenschutzPageAsync" />
+                    </div>
+                    <!-- Login: no state to preserve -->
+                    <div v-if="route.name === 'login'" class="page-scroll">
                         <RouterView />
                     </div>
                 </div>
@@ -28,15 +38,13 @@
 </template>
 
 <script setup lang="ts">
-import { ref, reactive, onMounted, computed, watch } from 'vue';
+import { ref, reactive, onMounted, computed, watch, defineAsyncComponent } from 'vue';
 import { useRoute } from 'vue-router';
 import { ws, auth, agents } from './store';
 import { THEME_LOGOS, useTheme } from './composables/useTheme';
 import { useChatStore } from './store/chat';
 import tenant from './tenant';
 
-import { defineAsyncComponent } from 'vue';
-
 import GridOverlay from './components/GridOverlay.vue';
 import BreakpointBadge from './components/BreakpointBadge.vue';
 import AppSidebar from './components/AppSidebar.vue';
@@ -44,18 +52,18 @@ import AppToolbar from './components/AppToolbar.vue';
 import router from './router';
 
 import TtsPlayerBar from './components/TtsPlayerBar.vue';
+import { HomePage, ImpressumPage, DatenschutzPage } from './tenantPages';
 const AgentsView = defineAsyncComponent(() => import('./views/AgentsView.vue'));
+const TestsView  = defineAsyncComponent(() => import('./views/TestsView.vue'));
 const ViewerView = tenant.features.viewer
     ? defineAsyncComponent(() => import('./views/ViewerView.vue'))
     : null;
+const HomePageAsync       = defineAsyncComponent(HomePage);
+const ImpressumPageAsync  = defineAsyncComponent(ImpressumPage);
+const DatenschutzPageAsync = defineAsyncComponent(DatenschutzPage);
 
 const chatStore = useChatStore();
-const visited = reactive({ nyx: false, viewer: false });
+const visited = reactive({ nyx: false, viewer: false, tests: false, home: false, impressum: false, datenschutz: false });
-const socketRoutes = ['nyx', ...(tenant.features.viewer ? ['viewer'] : [])];
-const isSocketRoute = computed(() => socketRoutes.includes(route.name as string));
-
-const routerReady = ref(false);
-router.isReady().then(() => { routerReady.value = true; });
 
 const route = useRoute();
 
@@ -68,7 +76,7 @@ const { theme } = useTheme();
 
 function handleLogout() {
     doLogout(disconnect);
-    visited.nyx = visited.viewer = false;
+    Object.keys(visited).forEach(k => (visited as any)[k] = false);
 }
 
 function maybeConnect() {

src/views/TestsView.vue

@@ -58,6 +58,7 @@
 
 <script setup lang="ts">
 import { ref, computed, onMounted } from 'vue';
+import { useRoute } from 'vue-router';
 import { getApiBase } from '../utils/apiBase';
 import { relativeTime } from '../utils/relativeTime';
 import { provideToolbar, useConnection } from '../composables/useToolbar';
@@ -90,8 +91,10 @@ const updatedAt = ref('');
 const expanded = ref<Set<string>>(new Set());
 
 // SSE connection — managed by useConnection, state surfaced in toolbar
+const _route = useRoute();
+const _viewActive = computed(() => _route.name === 'tests');
 const testConn = useConnection(`${getApiBase()}/api/test-results`, handleResult);
-provideToolbar({ groups: ['themes'], connection: testConn });
+provideToolbar({ groups: ['themes'], connection: testConn }, _viewActive);
 
 
 const displayResults = computed(() =>