fix: prefer header mime for media extensions

src/media/store.header-ext.test.ts

@@ -0,0 +1,38 @@
+import fs from "node:fs/promises";
+import path from "node:path";
+import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
+
+const realOs = await vi.importActual<typeof import("node:os")>("node:os");
+const HOME = path.join(realOs.tmpdir(), "clawdis-home-header-ext-test");
+
+vi.mock("node:os", () => ({
+  default: { homedir: () => HOME, tmpdir: () => realOs.tmpdir() },
+  homedir: () => HOME,
+  tmpdir: () => realOs.tmpdir(),
+}));
+
+vi.mock("./mime.js", async () => {
+  const actual = await vi.importActual<typeof import("./mime.js")>("./mime.js");
+  return {
+    ...actual,
+    detectMime: vi.fn(async () => "audio/opus"),
+  };
+});
+
+const store = await import("./store.js");
+
+describe("media store header extensions", () => {
+  beforeAll(async () => {
+    await fs.rm(HOME, { recursive: true, force: true });
+  });
+
+  afterAll(async () => {
+    await fs.rm(HOME, { recursive: true, force: true });
+  });
+
+  it("prefers header mime extension when sniffed mime lacks mapping", async () => {
+    const buf = Buffer.from("fake-audio");
+    const saved = await store.saveMediaBuffer(buf, "audio/ogg; codecs=opus");
+    expect(path.extname(saved.path)).toBe(".ogg");
+  });
+});