fix(captions): address code review findings

- Fix duplicate JSDoc opener in caption-utils.ts
- Fix BoxHighlight borderRadius snap (spring-animate radius for active,
  settle to 4px for spoken, instead of binary 0/8 threshold)
- Merge duplicate CaptionWrapper import in OpenReelsVideo.tsx
- Add missing test for empty-after-linger chunk path

Author: Talha Jubair Siam

src/remotion/captions/BoxHighlight.tsx

@@ -35,7 +35,7 @@ export const BoxHighlight: React.FC<CaptionStyleProps> = ({ wordStates, accentCo
               : ws.state === "spoken"
                 ? "rgba(255,255,255,0.08)"
                 : "transparent",
-            borderRadius: ws.springProgress > 0 ? 8 : 0,
+            borderRadius: isActive ? 8 * ws.springProgress : ws.state === "spoken" ? 4 : 0,
             padding: `4px ${pad}px`,
             opacity: ws.state === "unspoken" ? 0.4 : 1,
             textShadow: ws.state === "unspoken" ? "0 2px 8px rgba(0,0,0,0.6)" : "none",

src/remotion/captions/caption-utils.test.ts

@@ -114,4 +114,12 @@ describe("getWordChunk", () => {
     const { chunkStart } = getWordChunk(gapped, 0.8, 2, 0.3);
     expect(chunkStart).toBe(0);
   });
+
+  it("returns empty chunk after voiceover ends plus linger", () => {
+    // After the last word ends + lingerS, captions should fade out
+    // instead of showing stale text during a musical outro.
+    const { chunk, chunkStart } = getWordChunk(words, 5.0, 3, 0.3);
+    expect(chunk).toEqual([]);
+    expect(chunkStart).toBe(words.length);
+  });
 });

src/remotion/captions/caption-utils.ts

@@ -62,7 +62,6 @@ export function getWordState(word: WordTimestamp, currentTime: number): WordStat
 }
 
 /**
- /**
  * Compute WordRenderState[] for a chunk of words. Pure function, no React hooks.
  *
  * springFn receives a globalIndex and returns the spring progress (0-1) for that

src/remotion/compositions/OpenReelsVideo.tsx

@@ -14,12 +14,11 @@ import { TextCardBeat } from "../beats/TextCardBeat";
 import { BlockImpact } from "../captions/BlockImpact";
 import { BoldOutline } from "../captions/BoldOutline";
 import { BoxHighlight } from "../captions/BoxHighlight";
-import { CaptionWrapper, type SpringConfig } from "../captions/CaptionWrapper";
+import { CaptionWrapper, type SpringConfig, type CaptionStyleProps } from "../captions/CaptionWrapper";
 import { Clean } from "../captions/Clean";
 import { ColorHighlight } from "../captions/ColorHighlight";
 import { GradientRise } from "../captions/GradientRise";
 import { KaraokeSweep } from "../captions/KaraokeSweep";
-import type { CaptionStyleProps } from "../captions/CaptionWrapper";
 import type { CompositionProps, SceneProps } from "../lib/score-to-props";
 
 const BEAT_COMPONENTS: Record<string, React.FC<SceneProps>> = {