fix: theme toggle

apps/edr-freight-web/backoffice/src/shared/common/ui/sonner.tsx

@@ -1,12 +1,13 @@
-import { useTheme } from "next-themes"
 import { Toaster as Sonner, ToasterProps } from "sonner"
 
+// Pinned to "light": the app is light-only. This previously read next-themes'
+// useTheme, which falls back to "system" when no ThemeProvider is mounted (and
+// none is) — sonner then resolves "system" against prefers-color-scheme and
+// rendered dark toasts over a light UI on any OS set to dark.
 const Toaster = ({ ...props }: ToasterProps) => {
-  const { theme = "system" } = useTheme()
-
   return (
     <Sonner
-      theme={theme as ToasterProps["theme"]}
+      theme="light"
       className="toaster group"
       toastOptions={{
         classNames: {