Add language switching and enhance task/financial management features

Implement i18next for language switching in the header, enhance task and financial schemas, and add BudgetPlanner.tsx.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ff0be73b-afdd-4747-978b-bb8301fb0a82
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/9777c70b-fc38-4831-8d6b-78dfffe041b0/012e00c6-f380-4e55-bcb9-10f9adbfbb7b.jpg

client/src/components/layout/Header.tsx

@@ -12,6 +12,7 @@ import {
   DropdownMenuSeparator,
   DropdownMenuTrigger,
 } from "@/components/ui/dropdown-menu";
+import { LanguageSwitcher } from "@/components/LanguageSwitcher";
 import { 
   Moon, 
   Sun, 
@@ -21,10 +22,12 @@ import {
   LogOut, 
   Activity 
 } from "lucide-react";
+import { useTranslation } from "react-i18next";
 
 export default function Header() {
   const { user, logout } = useAuth();
   const { theme, toggleTheme } = useTheme();
+  const { t } = useTranslation();
   const [, setLocation] = useLocation();
 
   const handleLogout = async () => {
@@ -76,6 +79,9 @@ export default function Header() {
             <span className="text-xs text-muted-foreground hidden sm:inline">Voice Ready</span>
           </div>
 
+          {/* Language Switcher */}
+          <LanguageSwitcher />
+
           {/* Theme Toggle */}
           <Button
             variant="ghost"