feat(ui): add Tooltip open close microinteraction

- Add visible Tooltip motion timing and easing

- Preserve reduced-motion fallbacks

- Cover Tooltip motion contract with unit tests

ui/components/shadcn/tooltip.test.tsx

@@ -0,0 +1,66 @@
+import { render, screen } from "@testing-library/react";
+import { describe, expect, it } from "vitest";
+
+import { Tooltip, TooltipContent, TooltipTrigger } from "./tooltip";
+
+function renderOpenTooltip() {
+  return render(
+    <Tooltip open>
+      <TooltipTrigger>Copy ARN</TooltipTrigger>
+      <TooltipContent>Copy resource identifier</TooltipContent>
+    </Tooltip>,
+  );
+}
+
+describe("Tooltip", () => {
+  it("renders controlled content through the Radix Tooltip API", () => {
+    // Given
+    renderOpenTooltip();
+
+    // When
+    const tooltip = document.querySelector("[data-slot='tooltip-content']");
+
+    // Then
+    expect(screen.getByRole("tooltip")).toBeVisible();
+    expect(tooltip).toBeVisible();
+    expect(tooltip).toHaveTextContent("Copy resource identifier");
+  });
+
+  it("uses an intentional open and close motion contract", () => {
+    // Given
+    renderOpenTooltip();
+
+    // When
+    const tooltip = document.querySelector("[data-slot='tooltip-content']");
+
+    // Then
+    expect(tooltip).toHaveClass(
+      "origin-(--radix-tooltip-content-transform-origin)",
+      "animate-in",
+      "fade-in-0",
+      "zoom-in-95",
+      "duration-150",
+      "ease-out",
+      "data-[state=closed]:animate-out",
+      "data-[state=closed]:fade-out-0",
+      "data-[state=closed]:zoom-out-95",
+      "data-[state=closed]:duration-100",
+      "data-[state=closed]:ease-in",
+    );
+  });
+
+  it("removes transform-heavy tooltip motion for reduced-motion users", () => {
+    // Given
+    renderOpenTooltip();
+
+    // When
+    const tooltip = document.querySelector("[data-slot='tooltip-content']");
+
+    // Then
+    expect(tooltip).toHaveClass(
+      "motion-reduce:animate-none",
+      "motion-reduce:transform-none",
+      "motion-reduce:transition-none",
+    );
+  });
+});