feat(studio): hover-to-autoplay on render rows using shared ExpandedVideoPreview

Extracted shared ExpandedVideoPreview component (src/components/ui/)
used by both AssetsTab (video assets) and RenderQueueItem (rendered
videos). Wraps completed render rows in ExpandOnHover with the same
spring-expand + video autoplay pattern as the Compositions and Assets
tabs. No code duplication: AssetsTab video case delegates to the shared
component, RenderQueueItem reuses it with an Open action button.

packages/studio/src/components/renders/RenderQueueItem.tsx

@@ -1,4 +1,6 @@
 import { memo, useCallback, useState, useEffect, useRef } from "react";
+import { ExpandOnHover } from "../ui/ExpandOnHover";
+import { ExpandedVideoPreview } from "../ui/ExpandedVideoPreview";
 import type { RenderJob } from "./useRenderQueue";
 
 interface RenderQueueItemProps {
@@ -91,16 +93,15 @@ export const RenderQueueItem = memo(function RenderQueueItem({
     [job.id, job.filename],
   );
 
-  const isClickable = job.status === "complete";
+  const viewSrc = `/api/render/${job.id}/view`;
 
-  return (
+  const row = (
     <div
       onPointerEnter={() => setHovered(true)}
       onPointerLeave={() => setHovered(false)}
-      onClick={isClickable ? handleOpen : undefined}
       className={[
         "px-3 py-2.5 border-b border-neutral-800/30 last:border-0 transition-colors duration-150",
-        isClickable ? "cursor-pointer hover:bg-neutral-800/30" : "",
+        job.status === "complete" ? "cursor-pointer hover:bg-neutral-800/30" : "",
       ]
         .filter(Boolean)
         .join(" ")}
@@ -108,7 +109,7 @@ export const RenderQueueItem = memo(function RenderQueueItem({
       <div className="flex items-center gap-2.5">
         {/* Thumbnail — matches CompCard sizing (w-20 h-[45px]) */}
         <div className="w-20 h-[45px] rounded overflow-hidden bg-neutral-900 flex-shrink-0 relative">
-          {job.status === "complete" && <RenderThumbnail src={`/api/render/${job.id}/view`} />}
+          {job.status === "complete" && <RenderThumbnail src={viewSrc} />}
           {job.status === "rendering" && (
             <div className="w-full h-full flex items-center justify-center">
               <div className="w-2 h-2 rounded-full bg-[#3CE6AC] animate-pulse" />
@@ -139,7 +140,6 @@ export const RenderQueueItem = memo(function RenderQueueItem({
             )}
           </div>
 
-          {/* Progress bar + percentage */}
           {job.status === "rendering" && (
             <div className="mt-1">
               <div className="flex items-center justify-between mb-0.5">
@@ -214,4 +214,45 @@ export const RenderQueueItem = memo(function RenderQueueItem({
       </div>
     </div>
   );
+
+  // Completed renders: wrap in ExpandOnHover with shared ExpandedVideoPreview
+  // (same spring-expand pattern as AssetsTab video assets and CompositionsTab).
+  if (job.status !== "complete") {
+    return row;
+  }
+
+  const subtitle = [
+    job.durationMs ? formatDuration(job.durationMs) : null,
+    formatTimeAgo(job.createdAt),
+  ]
+    .filter(Boolean)
+    .join(" · ");
+
+  return (
+    <ExpandOnHover
+      expandedContent={
+        <ExpandedVideoPreview
+          src={viewSrc}
+          name={job.filename}
+          subtitle={subtitle}
+          action={
+            <button
+              onClick={(e) => {
+                e.stopPropagation();
+                handleOpen();
+              }}
+              className="px-4 py-1.5 text-xs font-semibold text-[#09090B] bg-[#3CE6AC] rounded-lg hover:brightness-110 transition-colors flex-shrink-0"
+            >
+              Open
+            </button>
+          }
+        />
+      }
+      onClick={handleOpen}
+      expandScale={0.5}
+      delay={500}
+    >
+      {row}
+    </ExpandOnHover>
+  );
 });

packages/studio/src/components/sidebar/AssetsTab.tsx

@@ -1,5 +1,6 @@
 import { memo, useState, useCallback, useRef } from "react";
 import { ExpandOnHover } from "../ui/ExpandOnHover";
+import { ExpandedVideoPreview } from "../ui/ExpandedVideoPreview";
 
 interface AssetsTabProps {
   projectId: string;
@@ -112,22 +113,33 @@ function ExpandedAssetPreview({
   isAudio: boolean;
   onCopy: () => void;
 }) {
+  if (isVideo) {
+    return (
+      <ExpandedVideoPreview
+        src={serveUrl}
+        name={name}
+        subtitle={asset}
+        action={
+          <button
+            onClick={(e) => {
+              e.stopPropagation();
+              onCopy();
+            }}
+            className="px-4 py-1.5 text-xs font-semibold text-[#09090B] bg-[#3CE6AC] rounded-lg hover:brightness-110 transition-colors flex-shrink-0"
+          >
+            Copy Path
+          </button>
+        }
+      />
+    );
+  }
+
   return (
     <div className="w-full h-full bg-neutral-950 rounded-[16px] overflow-hidden flex flex-col">
       <div className="flex-1 min-h-0 flex items-center justify-center bg-black p-4">
         {isImage && (
           <img src={serveUrl} alt={name} className="max-w-full max-h-full object-contain rounded" />
         )}
-        {isVideo && (
-          <video
-            src={serveUrl}
-            autoPlay
-            muted
-            loop
-            playsInline
-            className="max-w-full max-h-full object-contain rounded"
-          />
-        )}
         {isAudio && (
           <div className="flex flex-col items-center gap-4">
             <svg

packages/studio/src/components/ui/ExpandedVideoPreview.tsx

@@ -0,0 +1,37 @@
+import type { ReactNode } from "react";
+
+interface ExpandedVideoPreviewProps {
+  src: string;
+  name: string;
+  subtitle: string;
+  action: ReactNode;
+}
+
+/**
+ * Shared expanded video preview used by AssetsTab (video assets) and
+ * the Renders panel. Autoplays the video muted+looped inside a full-bleed
+ * card. Caller provides the footer action slot (Copy Path, Open, etc.).
+ */
+export function ExpandedVideoPreview({ src, name, subtitle, action }: ExpandedVideoPreviewProps) {
+  return (
+    <div className="w-full h-full bg-neutral-950 rounded-[16px] overflow-hidden flex flex-col">
+      <div className="flex-1 min-h-0 flex items-center justify-center bg-black p-4">
+        <video
+          src={src}
+          autoPlay
+          muted
+          loop
+          playsInline
+          className="max-w-full max-h-full object-contain rounded"
+        />
+      </div>
+      <div className="px-5 py-3 bg-neutral-900 border-t border-neutral-800/50 flex items-center justify-between flex-shrink-0">
+        <div className="min-w-0 flex-1 mr-4">
+          <div className="text-sm font-medium text-neutral-200 truncate">{name}</div>
+          <div className="text-[10px] text-neutral-600 font-mono mt-0.5 truncate">{subtitle}</div>
+        </div>
+        {action}
+      </div>
+    </div>
+  );
+}