fix: Always respect the returned MIME type (#2473)

- Closes #2449

tests/utils/mime-type.test.ts

@@ -0,0 +1,50 @@
+import { describe, expect, it } from 'vitest';
+import { classifyMimeType } from '../../src/utils/mime-type';
+
+describe('classifyMimeType', () => {
+  it('classifies undefined as neither video nor HLS', () => {
+    expect(classifyMimeType(undefined)).toEqual({ isHLS: false, isVideo: false });
+  });
+
+  it('classifies an empty string as neither video nor HLS', () => {
+    expect(classifyMimeType('')).toEqual({ isHLS: false, isVideo: false });
+  });
+
+  it('classifies application/vnd.apple.mpegurl as HLS and video', () => {
+    expect(classifyMimeType('application/vnd.apple.mpegurl')).toEqual({
+      isHLS: true,
+      isVideo: true,
+    });
+  });
+
+  it('classifies application/x-mpegurl as HLS and video', () => {
+    expect(classifyMimeType('application/x-mpegurl')).toEqual({
+      isHLS: true,
+      isVideo: true,
+    });
+  });
+
+  it('treats HLS mime types as case-insensitive', () => {
+    expect(classifyMimeType('application/x-mpegURL')).toEqual({
+      isHLS: true,
+      isVideo: true,
+    });
+    expect(classifyMimeType('APPLICATION/VND.APPLE.MPEGURL')).toEqual({
+      isHLS: true,
+      isVideo: true,
+    });
+  });
+
+  it('classifies video/* as video but not HLS', () => {
+    expect(classifyMimeType('video/mp4')).toEqual({ isHLS: false, isVideo: true });
+    expect(classifyMimeType('VIDEO/WEBM')).toEqual({ isHLS: false, isVideo: true });
+  });
+
+  it('classifies non-video mime types as neither', () => {
+    expect(classifyMimeType('image/jpeg')).toEqual({ isHLS: false, isVideo: false });
+    expect(classifyMimeType('application/json')).toEqual({
+      isHLS: false,
+      isVideo: false,
+    });
+  });
+});