feat: enhance global styles and component themes with new semantic colors; integrate ThemeProvider for improved theme management and update color usage across various components for consistency

components/statistics/savings-trend-chart.tsx

@@ -36,13 +36,13 @@ export function SavingsTrendChart({
         <CardTitle>Évolution des économies</CardTitle>
         <div className="flex items-center gap-2">
           {isPositive ? (
-            <TrendingUp className="w-4 h-4 text-emerald-600" />
+            <TrendingUp className="w-4 h-4 text-success" />
           ) : (
-            <TrendingDown className="w-4 h-4 text-red-600" />
+            <TrendingDown className="w-4 h-4 text-destructive" />
           )}
           <span
             className={`text-sm font-semibold ${
-              isPositive ? "text-emerald-600" : "text-red-600"
+              isPositive ? "text-success" : "text-destructive"
             }`}
           >
             {formatCurrency(latestSavings)}