Implemented Fix

The scroll input and UI rendering are decoupled from poster download. Uncached remote posters are queued to a dedicated love.thread worker and the UI renders the existing empty/placeholder frame until the worker reports completion.

• resolve_art_path no longer shells out to curl on the main thread.
• Remote poster fetches use separate poster request/result channels and do not reuse the audio/channel loader state.
• The Jellyfin broker emits thumbnail poster URLs with fillWidth=180&fillHeight=270&quality=70, and the broker preserves those query parameters while proxying /image/.../primary.jpg.
• Image decoding remains on the main Love2D thread, but it is queued, skipped while directional input is active, and limited to one image per frame.
• Selected poster loading is debounced until scrolling settles for about 250 ms.
• Grid/list drawing queues visible image decode work and renders placeholders until the decode budget catches up.
• Selection changes prefetch only the selected item plus four neighbors on each side. Prefetch downloads only; it does not force immediate image decode. There is no full-catalog cache warmer in this pass.
• Jellyfin catalog loading runs in a dedicated worker after local indexes load. Local files render immediately, then VOD titles merge when /catalog returns.
• R2 lock no longer turns the display off. It draws a visible lock screen with current status and R2 unlock.
• AquaSystem keeps the RipTide collection entry, but RipTide.sh now launches the current riptide-aquatv runtime directory.