feat: add frontend episode classification client

static/player/episodes/classifications.test.ts

@@ -0,0 +1,26 @@
+import assert from "node:assert/strict";
+import { before, test } from "node:test";
+
+before(() => {
+  Object.assign(globalThis, {
+    document: {
+      createElement: () => ({ classList: { add: () => undefined, remove: () => undefined } }),
+    },
+  });
+});
+
+test("parses only valid episode classifications", async () => {
+  const { parseEpisodeClassifications } = await import("./classifications");
+  assert.deepEqual(
+    parseEpisodeClassifications([
+      { filler: true, number: 2, recap: false },
+      { filler: false, number: 3, recap: true },
+      { filler: "true", number: 4, recap: false },
+      { filler: false, number: 0, recap: false },
+    ]),
+    [
+      { filler: true, number: 2, recap: false },
+      { filler: false, number: 3, recap: true },
+    ],
+  );
+});