refactor: prevent unnecessary prop drilling

Components throughout the tree are anyways utilizing the zustand store,
so there is no reason to send props for the same store methods.

js/src/features/playback/media-particle-view.tsx

@@ -8,7 +8,6 @@ import { useAudioSource } from "@/components/audio/use-audio-source";
 
 interface MediaParticleViewProps {
   particle: StreamParticle;
-  onEnded: () => void;
 }
 
 function formatTime(ms: number): string {
@@ -36,12 +35,12 @@ function DurationPill({
 
 export function MediaParticleView({
   particle,
-  onEnded,
 }: MediaParticleViewProps) {
   const cachedUrl = usePlaybackStore(
     (s) => s.downloadUrlCache[particle.id],
   );
   const cacheDownloadUrl = usePlaybackStore((s) => s.cacheDownloadUrl);
+  const next = usePlaybackStore((s) => s.next);
   const paused = usePlaybackStore((s) => s.paused);
   const [error, setError] = useState<string | null>(null);
 
@@ -113,7 +112,7 @@ export function MediaParticleView({
           crossOrigin="anonymous"
           src={cachedUrl}
           autoPlay
-          onEnded={onEnded}
+          onEnded={next}
           onTimeUpdate={(e) => {
             setCurrentTimeMs(e.currentTarget.currentTime * 1000);
           }}
@@ -134,7 +133,7 @@ export function MediaParticleView({
         src={cachedUrl}
         autoPlay
         playsInline
-        onEnded={onEnded}
+        onEnded={next}
         onTimeUpdate={(e) => {
           setCurrentTimeMs(e.currentTarget.currentTime * 1000);
         }}

js/src/features/playback/particle-renderer.tsx

@@ -10,15 +10,14 @@ import { AckButton } from "./ack-button";
 
 interface ParticleRendererProps {
   particle: StreamParticle;
-  onNext: () => void;
-  onPrev: () => void;
 }
 
 export function ParticleRenderer({
   particle,
-  onNext,
-  onPrev,
 }: ParticleRendererProps) {
+  const next = usePlaybackStore((s) => s.next);
+  const prev = usePlaybackStore((s) => s.prev);
+
   const markParticlesSeen = useAppStore((s) => s.markParticlesSeen);
   const markedRef = useRef<string | null>(null);
 
@@ -33,15 +32,15 @@ export function ParticleRenderer({
   const handleClick = (e: React.MouseEvent<HTMLDivElement>) => {
     const rect = e.currentTarget.getBoundingClientRect();
     const x = (e.clientX - rect.left) / rect.width;
-    if (x < 0.3) onPrev();
+    if (x < 0.3) prev();
-    else if (x > 0.7) onNext();
+    else if (x > 0.7) next();
   };
 
   const renderContent = () => {
     switch (particle.type) {
       case "media":
-        {/* NOTE: it's more robust to re-mount the MediaParticleView when the particle changes, to ensure playback state is well-behaved */}
+        {/* NOTE: it's more robust to re-mount the MediaParticleView when the particle changes, to ensure playback state is well-behaved */ }
-        return <MediaParticleView key={particle.id} particle={particle} onEnded={onNext} />;
+        return <MediaParticleView key={particle.id} particle={particle} />;
       case "text":
         return <TextParticleView particle={particle} />;
       default:
@@ -61,3 +60,14 @@ export function ParticleRenderer({
     </div>
   );
 }
+
+function RenderParticle({ particle }: { particle: StreamParticle }) {
+  switch (particle.type) {
+    case "media":
+      return <MediaParticleView particle={particle} />;
+    case "text":
+      return <TextParticleView particle={particle} />;
+    default:
+      return <FallbackParticleView particle={particle} />;
+  }
+}

js/src/pages/stream-player-page.tsx

@@ -211,11 +211,7 @@ export function StreamPlayerPage() {
       {/* Particle content — fills entire viewport */}
       <div className="absolute inset-0">
         {currentParticle && (
-          <ParticleRenderer
+          <ParticleRenderer particle={currentParticle} />
-            particle={currentParticle}
-            onNext={next}
-            onPrev={prev}
-          />
         )}
       </div>