fix: enforce semantic contrast across admin

src/app/admin/favicon/favicon-form.tsx

@@ -91,7 +91,7 @@ export function FaviconForm({ currentUrl }: { currentUrl: string | null }) {
               name="file"
               accept=".png,.jpg,.jpeg,.gif,.webp,.ico,.svg"
               required
-              className="block w-full text-sm text-[var(--color-text)] file:mr-3 file:py-2 file:px-4 file:rounded-lg file:border-0 file:text-sm file:font-semibold file:bg-[var(--color-primary)] file:text-white hover:file:bg-[var(--color-primary-hover)] cursor-pointer"
+              className="block w-full text-sm text-[var(--color-text-readable)] file:mr-3 file:py-2 file:px-4 file:rounded-lg file:border-0 file:text-sm file:font-semibold file:bg-[var(--color-primary)] file:text-[var(--color-primary-foreground-readable)] cursor-pointer"
             />
             <p className="mt-1 text-xs text-[var(--color-text-muted)]">{t("uploadHint")}</p>
           </div>
@@ -112,8 +112,8 @@ export function FaviconForm({ currentUrl }: { currentUrl: string | null }) {
           <div
             className={`mt-4 p-3 rounded-lg text-sm ${
               message.type === "success"
-                ? "bg-green-500/10 text-green-600 dark:text-green-400"
-                : "bg-red-500/10 text-red-600 dark:text-red-400"
+                ? "bg-[var(--color-success-subtle)] text-[var(--color-success-text-readable)] dark:text-[var(--color-success-text-readable)]"
+                : "bg-[var(--color-error-subtle)] text-[var(--color-error-text-readable)] dark:text-[var(--color-error-text-readable)]"
             }`}
           >
             {message.text}