cleanup unnecessary logic and complexity

js/desktop/src/features/particles/stream-view.tsx

@@ -213,10 +213,7 @@ function StreamViewInner({ path, streamParticle }: StreamViewProps) {
   });
 
   const userId = useAuthStore((s) => s.user?.id);
-  const { mode, toggle: toggleViewMode } = useStreamViewMode(
-    streamParticle,
-    userId,
-  );
+  const { mode, toggle: toggleViewMode } = useStreamViewMode();
 
   const {
     children,

js/desktop/src/hooks/use-stream-view-mode.ts

@@ -1,24 +1,11 @@
 import { useCallback, useState } from 'react';
-import type { Particle } from '@/api/types';
 
 export type StreamViewMode = 'player' | 'list';
 
-// Deprecated: now we always start with player mode
-function decideMode(
-  streamParticle: Particle & { type: 'stream' },
-  userId: string | undefined,
-): StreamViewMode {
-  const marker = userId ? streamParticle.playback_markers?.[userId] : undefined;
-  const lastChildAt = streamParticle.last_child_created_at;
-  const caughtUp =
-    !!marker && !!lastChildAt && lastChildAt.getTime() <= marker.getTime();
-  return caughtUp ? 'list' : 'player';
-}
-
-export function useStreamViewMode(
-  streamParticle: Particle & { type: 'stream' },
-  userId: string | undefined,
-): { mode: StreamViewMode; toggle: () => void } {
+export function useStreamViewMode(): {
+  mode: StreamViewMode;
+  toggle: () => void;
+} {
   const [mode, setMode] = useState<StreamViewMode>('player');
   const toggle = useCallback(() => {
     setMode((prev) => (prev === 'player' ? 'list' : 'player'));