Fix scroll bounds for long select dropdowns (#4798)

Co-authored-by: Xvvln <180168103+Xvvln@users.noreply.github.com>

tests/components/SelectContentScroll.test.ts

@@ -0,0 +1,29 @@
+import fs from "node:fs";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+
+const SELECT_TSX = path.resolve(
+  __dirname,
+  "..",
+  "..",
+  "src",
+  "components",
+  "ui",
+  "select.tsx",
+);
+
+describe("SelectContent scroll bounds", () => {
+  const source = fs.readFileSync(SELECT_TSX, "utf8");
+
+  it("limits popper content to the available viewport height", () => {
+    expect(source).toContain("--radix-select-content-available-height");
+    expect(source).toContain(
+      "max-h-[min(24rem,var(--radix-select-content-available-height))]",
+    );
+  });
+
+  it("allows long option lists to scroll vertically", () => {
+    expect(source).toContain("overflow-y-auto");
+    expect(source).toContain("overflow-x-hidden");
+  });
+});