Watch: pre-cache favorite and frequently used stickers#2248
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Stickers were downloaded on-demand only when visible and cancelled when scrolled off-screen, causing them to re-download every time the picker opened. This adds: - StickerPickerStore.prefetchStickers() that pre-downloads all favorite and recent sticker render files at priority 4 (highest) - Pinned file IDs protected from cancellation by cancelFileDownload() - TGBridgeStickersSignals.prefetchRecentStickersWithLimit: that triggers the full image download pipeline for recent stickers through TGFileCache - Re-enabled the in-memory caching layer for recent stickers in the legacy WatchKit extension - TGStickersController now calls prefetch after loading the sticker list
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Stickers were downloaded on-demand only when visible and cancelled when scrolled off-screen, causing them to re-download every time the picker opened. This adds: