fix(studio): address timeline PR review — drop dead code, add fadeIn keyframes, compSrc test

packages/studio/src/hooks/useRenderClipContent.test.ts

@@ -0,0 +1,50 @@
+import { describe, expect, it } from "vitest";
+import { normalizeCompositionSrc } from "./useRenderClipContent";
+
+describe("normalizeCompositionSrc", () => {
+  const origin = "http://localhost:5190";
+  const pid = "my-project";
+
+  it("strips absolute preview URL to relative path", () => {
+    const result = normalizeCompositionSrc(
+      "http://localhost:5190/api/projects/my-project/preview/compositions/intro.html",
+      pid,
+      origin,
+    );
+    expect(result).toBe("compositions/intro.html");
+  });
+
+  it("preserves already-relative paths", () => {
+    const result = normalizeCompositionSrc("compositions/intro.html", pid, origin);
+    expect(result).toBe("compositions/intro.html");
+  });
+
+  it("preserves absolute URLs from different origins", () => {
+    const result = normalizeCompositionSrc(
+      "https://cdn.example.com/compositions/intro.html",
+      pid,
+      origin,
+    );
+    expect(result).toBe("https://cdn.example.com/compositions/intro.html");
+  });
+
+  it("preserves absolute URLs for different projects", () => {
+    const result = normalizeCompositionSrc(
+      "http://localhost:5190/api/projects/other-project/preview/compositions/intro.html",
+      pid,
+      origin,
+    );
+    expect(result).toBe(
+      "http://localhost:5190/api/projects/other-project/preview/compositions/intro.html",
+    );
+  });
+
+  it("handles nested composition paths", () => {
+    const result = normalizeCompositionSrc(
+      "http://localhost:5190/api/projects/my-project/preview/compositions/scenes/hero.html",
+      pid,
+      origin,
+    );
+    expect(result).toBe("compositions/scenes/hero.html");
+  });
+});

packages/studio/src/hooks/useRenderClipContent.ts

@@ -5,6 +5,23 @@ import type { TimelineElement } from "../player";
 import { AudioWaveform } from "../player/components/AudioWaveform";
 import { getTimelineElementLabel } from "../utils/studioHelpers";
 
+export function normalizeCompositionSrc(
+  compSrc: string,
+  projectId: string,
+  origin: string,
+): string {
+  try {
+    const parsed = new URL(compSrc, origin);
+    const previewPrefix = `/api/projects/${projectId}/preview/`;
+    if (parsed.pathname.startsWith(previewPrefix)) {
+      return parsed.pathname.slice(previewPrefix.length);
+    }
+  } catch {
+    // already relative
+  }
+  return compSrc;
+}
+
 interface UseRenderClipContentOptions {
   projectIdRef: { current: string | null };
   compIdToSrc: Map<string, string>;
@@ -25,15 +42,7 @@ export function useRenderClipContent({
 
       let compSrc = el.compositionSrc;
       if (compSrc) {
-        try {
-          const parsed = new URL(compSrc, window.location.origin);
-          const previewPrefix = `/api/projects/${pid}/preview/`;
-          if (parsed.pathname.startsWith(previewPrefix)) {
-            compSrc = parsed.pathname.slice(previewPrefix.length);
-          }
-        } catch {
-          // already relative
-        }
+        compSrc = normalizeCompositionSrc(compSrc, pid, window.location.origin);
       }
       if (compSrc && compIdToSrc.size > 0) {
         const resolved =
@@ -50,7 +59,7 @@ export function useRenderClipContent({
           previewUrl: `/api/projects/${pid}/preview/comp/${compSrc}`,
           label: getTimelineElementLabel(el),
           labelColor: style.label,
-          accentColor: style.clip,
+
           seekTime: 0,
           duration: el.duration,
         });
@@ -63,7 +72,7 @@ export function useRenderClipContent({
           previewUrl: activePreviewUrl,
           label: getTimelineElementLabel(el),
           labelColor: style.label,
-          accentColor: style.clip,
+
           selector: el.selector,
           selectorIndex: el.selectorIndex,
           seekTime: el.start,
@@ -119,7 +128,7 @@ export function useRenderClipContent({
           previewUrl: `/api/projects/${pid}/preview`,
           label: getTimelineElementLabel(el),
           labelColor: style.label,
-          accentColor: style.clip,
+
           selector: el.selector,
           selectorIndex: el.selectorIndex,
           seekTime: el.start,

packages/studio/src/player/components/CompositionThumbnail.tsx

@@ -5,7 +5,6 @@ interface CompositionThumbnailProps {
   previewUrl: string;
   label: string;
   labelColor: string;
-  accentColor?: string;
   selector?: string;
   selectorIndex?: number;
   seekTime?: number;
@@ -52,7 +51,6 @@ export const CompositionThumbnail = memo(function CompositionThumbnail({
   previewUrl,
   label,
   labelColor,
-  accentColor: _accentColor = "#6B7280",
   selector,
   selectorIndex,
   seekTime = 2,
@@ -112,7 +110,7 @@ export const CompositionThumbnail = memo(function CompositionThumbnail({
       {loaded && (
         <div
           className="absolute inset-0 flex"
-          style={{ animation: "fadeIn 200ms ease-out", mixBlendMode: "lighten" }}
+          style={{ animation: "hf-thumb-fade 200ms ease-out", mixBlendMode: "lighten" }}
         >
           {Array.from({ length: frameCount }).map((_, i) => (
             <div

packages/studio/src/player/components/timelineTheme.ts

@@ -35,17 +35,13 @@ export interface TimelineTheme {
   clipRadius: string;
 }
 
-const UNIFIED_STYLE: TimelineTrackStyle = {
+const TRACK_STYLE: TimelineTrackStyle = {
   clip: "#1c2028",
   accent: "#3CE6AC",
   label: "#dde1e8",
   iconBackground: "rgba(255,255,255,0.06)",
 };
 
-function createTrackStyle(_tag: string): TimelineTrackStyle {
-  return UNIFIED_STYLE;
-}
-
 export const defaultTimelineTheme: TimelineTheme = {
   shellBackground: "#0A0A0B",
   shellBorder: "rgba(255,255,255,0.05)",
@@ -74,16 +70,8 @@ export const defaultTimelineTheme: TimelineTheme = {
   clipRadius: "6px",
 };
 
-export function getTimelineTrackStyle(tag: string): TimelineTrackStyle {
-  const normalized = tag.toLowerCase();
-  if (
-    normalized.startsWith("h") &&
-    normalized.length === 2 &&
-    "123456".includes(normalized[1] ?? "")
-  ) {
-    return createTrackStyle("h1");
-  }
-  return createTrackStyle(normalized);
+export function getTimelineTrackStyle(_tag: string): TimelineTrackStyle {
+  return TRACK_STYLE;
 }
 
 export function getClipHandleOpacity({

packages/studio/src/styles/studio.css

@@ -152,6 +152,11 @@ body {
   background: rgba(255, 255, 255, 0.1);
 }
 
+@keyframes hf-thumb-fade {
+  from { opacity: 0; }
+  to { opacity: 1; }
+}
+
 .hf-loader-progress__fill {
   width: 100%;
   height: 100%;