fix(ui): add cursor-pointer to base button variants

frontend/src/components/ui/button-variants.ts

@@ -1,7 +1,7 @@
 import { cva } from "class-variance-authority"
 
 export const buttonVariants = cva(
-  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-all disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 shrink-0 [&_svg]:shrink-0 outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px] aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
+  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-all cursor-pointer disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 shrink-0 [&_svg]:shrink-0 outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px] aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
   {
     variants: {
       variant: {

frontend/src/components/ui/button.test.tsx

@@ -0,0 +1,21 @@
+import { render, screen } from "@testing-library/react"
+import { describe, expect, it } from "vitest"
+import { Button } from "./button"
+
+describe("Button component", () => {
+  it("renders with a pointer cursor", () => {
+    render(<Button>Click me</Button>)
+    const button = screen.getByRole("button", { name: /click me/i })
+    expect(button).toHaveClass("cursor-pointer")
+  })
+
+  it("renders different variants with a pointer cursor", () => {
+    const { rerender } = render(<Button variant="outline">Outline</Button>)
+    let button = screen.getByRole("button", { name: /outline/i })
+    expect(button).toHaveClass("cursor-pointer")
+
+    rerender(<Button variant="destructive">Destructive</Button>)
+    button = screen.getByRole("button", { name: /destructive/i })
+    expect(button).toHaveClass("cursor-pointer")
+  })
+})