feat(renderer): add shadcn Toaster primitive

src/renderer/components/ui/sonner.tsx

@@ -0,0 +1,34 @@
+"use client"
+
+import { useTheme } from "next-themes"
+import { Toaster as Sonner } from "sonner"
+
+type ToasterProps = React.ComponentProps<typeof Sonner>
+
+const Toaster = ({ ...props }: ToasterProps) => {
+  const { theme = "system" } = useTheme()
+
+  return (
+    <Sonner
+      theme={theme as ToasterProps["theme"]}
+      className="toaster group"
+      toastOptions={{
+        classNames: {
+          toast:
+            "group toast group-[.toaster]:bg-background group-[.toaster]:text-foreground group-[.toaster]:border-border group-[.toaster]:shadow-lg",
+          description: "group-[.toast]:text-muted-foreground",
+          actionButton:
+            "group-[.toast]:bg-primary group-[.toast]:text-primary-foreground",
+          cancelButton:
+            "group-[.toast]:bg-muted group-[.toast]:text-muted-foreground",
+        },
+      }}
+      richColors
+      closeButton
+      position="bottom-right"
+      {...props}
+    />
+  )
+}
+
+export { Toaster }

tests/component/ui/sonner.test.tsx

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+import { describe, it, expect } from 'vitest';
+import { render } from '@testing-library/react';
+import { Toaster } from '@/components/ui/sonner';
+import { ThemeProvider } from '@/components/theme-provider';
+
+describe('Toaster', () => {
+  it('renders inside ThemeProvider without crashing', () => {
+    const { container } = render(
+      <ThemeProvider defaultTheme="light" attribute="class">
+        <Toaster />
+      </ThemeProvider>
+    );
+    // The Toaster portal is mounted at body level, so the container may be empty
+    // but the test should not throw
+    expect(container).toBeDefined();
+  });
+});