feat(app): новый визуальный язык, верхняя навигация, портфели, создание счетов и ручные события

Тема и общие виджеты (AssetIcon, ServiceMark, HelpTip, глоссарий), верхняя панель TopNav и вкладки Аналитики вместо NavSidebar, иконки PWA. Экраны: портфели, создание брокерского счёта, ручное событие, правка инструмента, Обзор карточками по скоупам и таблица активов, пересчёт метрик с опросом /metrics/status. design-system.md обновлён.

app/lib/features/shell/app_shell.dart

@@ -1,21 +1,22 @@
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 
+import 'analytics_tabs.dart';
 import 'nav_destinations.dart';
-import 'nav_sidebar.dart';
+import 'top_nav.dart';
 
-/// Breakpoints per the plan: bottom bar under 600, collapsed rail 600–1200,
-/// extended rail at 1200 and above.
+/// Below this width the shell falls back to a bottom [NavigationBar]; from here up it is the
+/// [TopNav] bar.
 const _narrowBreakpoint = 600.0;
-const _wideBreakpoint = 1200.0;
 
-/// Adaptive navigation shell around the current route: a bottom
-/// [NavigationBar] on narrow surfaces, a collapsed [NavigationRail] on medium
-/// ones, and the grouped [NavSidebar] on wide ones.
+/// Adaptive navigation shell around the current route: a bottom [NavigationBar] on narrow
+/// surfaces and the [TopNav] bar on wider ones, with the Аналитика tab strip under it while
+/// one of the analytics screens is open.
 ///
-/// The rail and the sidebar show every destination. The bottom bar shows the four primary
-/// ones plus «Ещё», which opens the rest in a sheet: twelve destinations in a phone-width
-/// bar would leave about 30 px per label, which is not navigation but decoration.
+/// The top bar shows every destination (the ledger ones behind «Операции»). The bottom bar
+/// shows the four primary ones plus «Ещё», which opens the rest in a sheet: twelve
+/// destinations in a phone-width bar would leave about 30 px per label, which is not
+/// navigation but decoration.
 class AppShell extends StatelessWidget {
   const AppShell({required this.location, required this.child, super.key});
 
@@ -80,28 +81,32 @@ class AppShell extends StatelessWidget {
       );
     }
 
-    final extended = width >= _wideBreakpoint;
     return Scaffold(
-      body: Row(
+      body: Column(
         children: [
-          if (extended)
-            NavSidebar(selectedIndex: _selectedIndex, onSelect: (i) => _onSelect(context, i))
-          else
-            NavigationRail(
-              selectedIndex: _selectedIndex,
-              onDestinationSelected: (i) => _onSelect(context, i),
-              labelType: NavigationRailLabelType.selected,
-              destinations: [
-                for (final d in navDestinations)
-                  NavigationRailDestination(
-                    icon: Icon(d.icon),
-                    selectedIcon: Icon(d.selectedIcon),
-                    label: Text(d.label),
-                  ),
-              ],
+          TopNav(
+            selectedIndex: _selectedIndex,
+            onSelect: (i) => _onSelect(context, i),
+          ),
+          Expanded(
+            child: Align(
+              alignment: Alignment.topCenter,
+              child: ConstrainedBox(
+                constraints: const BoxConstraints(maxWidth: kContentMaxWidth),
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.stretch,
+                  children: [
+                    if (AnalyticsTabs.contains(location))
+                      Padding(
+                        padding: const EdgeInsets.fromLTRB(16, 16, 16, 0),
+                        child: AnalyticsTabs(location: location),
+                      ),
+                    Expanded(child: child),
+                  ],
+                ),
+              ),
             ),
-          const VerticalDivider(width: 1),
-          Expanded(child: SafeArea(child: child)),
+          ),
         ],
       ),
     );