feat(balance): add sidebar Bilan entry

Insert a new "Bilan" / "Balance sheet" entry in NAV_ITEMS pointing
at /balance with the Wallet lucide-react icon. Position: between
Reports and Settings, matching the autopilot prompt instruction
and the spec-plan-bilan v2 ordering.

Sidebar.tsx imports Wallet and registers it in iconMap.

Refs: #141

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/layout/Sidebar.tsx

@@ -8,6 +8,7 @@ import {
   SlidersHorizontal,
   PiggyBank,
   BarChart3,
+  Wallet,
   Settings,
   Languages,
   Moon,
@@ -25,6 +26,7 @@ const iconMap: Record<string, React.ComponentType<{ size?: number }>> = {
   SlidersHorizontal,
   PiggyBank,
   BarChart3,
+  Wallet,
   Settings,
 };
 

src/shared/constants/index.ts

@@ -46,6 +46,12 @@ export const NAV_ITEMS: NavItem[] = [
     icon: "BarChart3",
     labelKey: "nav.reports",
   },
+  {
+    key: "balance",
+    path: "/balance",
+    icon: "Wallet",
+    labelKey: "nav.balance",
+  },
   {
     key: "settings",
     path: "/settings",