fix: use backend video preview urls

src/components/messageStream/utils/videoPreviewSource.test.ts

@@ -8,8 +8,9 @@ import {
 const attachment: Attachment = {
   id: "att-1",
   kind: "video",
-  url: "/uploads/desktop-preview.mp4",
-  mobilePreviewUrl: "/uploads/mobile-540p-preview.mp4",
+  url: "/uploads/legacy-preview.mp4",
+  desktopUrl: "/uploads/desktop-preview.mp4",
+  mobileUrl: "/uploads/mobile-540p-preview.mp4",
   mime: "video/mp4",
   filename: "original.mp4",
   sizeBytes: 1024,
@@ -22,18 +23,27 @@ describe("videoPreviewSource", () => {
     );
   });
 
-  it("uses mobilePreviewUrl only when mobile preview is active", () => {
+  it("uses mobileUrl only when mobile preview is active", () => {
     expect(videoPreviewSource(attachment, true)).toBe(
       "/uploads/mobile-540p-preview.mp4",
     );
   });
 
-  it("falls back to the desktop preview when mobilePreviewUrl is absent", () => {
+  it("falls back to the desktop preview when mobileUrl is absent", () => {
     expect(
-      videoPreviewSource({ ...attachment, mobilePreviewUrl: undefined }, true),
+      videoPreviewSource({ ...attachment, mobileUrl: undefined }, true),
     ).toBe("/uploads/desktop-preview.mp4");
   });
 
+  it("falls back to url when desktopUrl is absent", () => {
+    expect(
+      videoPreviewSource(
+        { ...attachment, desktopUrl: undefined, mobileUrl: undefined },
+        false,
+      ),
+    ).toBe("/uploads/legacy-preview.mp4");
+  });
+
   it("adds a metadata seek fragment only when the URL has no fragment", () => {
     expect(videoMetadataPreviewSource("/uploads/video.mp4")).toBe(
       "/uploads/video.mp4#t=0.1",

src/components/messageStream/utils/videoPreviewSource.ts

@@ -6,10 +6,10 @@ export function videoPreviewSource(
   attachment: Attachment,
   useMobilePreview: boolean,
 ): string {
-  if (useMobilePreview && attachment.mobilePreviewUrl) {
-    return attachment.mobilePreviewUrl;
+  if (useMobilePreview && attachment.mobileUrl) {
+    return attachment.mobileUrl;
   }
-  return attachment.url;
+  return attachment.desktopUrl || attachment.url;
 }
 
 export function videoMetadataPreviewSource(url: string): string {