test: add frontend test suite

src/video.test.ts

@@ -0,0 +1,11 @@
+import { describe, expect, it } from "vitest";
+import { isLikelyVideoPath } from "./video";
+
+describe("isLikelyVideoPath", () => {
+  it("detects common video extensions and ignores query strings", () => {
+    expect(isLikelyVideoPath("/uploads/intro.MP4?token=1")).toBe(true);
+    expect(isLikelyVideoPath("https://cdn.example.com/demo.webm")).toBe(true);
+    expect(isLikelyVideoPath("/uploads/file.pdf")).toBe(false);
+    expect(isLikelyVideoPath(undefined)).toBe(false);
+  });
+});