feat(renderer): add shadcn textarea primitive

src/renderer/components/ui/textarea.tsx

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+import * as React from "react"
+
+import { cn } from "@/lib/utils"
+
+export interface TextareaProps
+  extends React.TextareaHTMLAttributes<HTMLTextAreaElement> {}
+
+const Textarea = React.forwardRef<HTMLTextAreaElement, TextareaProps>(
+  ({ className, ...props }, ref) => {
+    return (
+      <textarea
+        className={cn(
+          "flex min-h-[80px] w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50",
+          className
+        )}
+        ref={ref}
+        {...props}
+      />
+    )
+  }
+)
+Textarea.displayName = "Textarea"
+
+export { Textarea }

tests/component/ui/textarea.test.tsx

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+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { Textarea } from '@/components/ui/textarea';
+
+describe('Textarea', () => {
+  it('renders a multi-line input', () => {
+    render(<Textarea aria-label="notes" defaultValue="hello" />);
+    const ta = screen.getByLabelText(/notes/i);
+    expect(ta.tagName).toBe('TEXTAREA');
+    expect(ta).toHaveValue('hello');
+  });
+});