fix: crisp full media for large stickers/custom emoji

[anriltine]

Summary

• Stops forcing low-res document{id}?size=m preview when stickers/custom emoji are shown large (CSS size ≥ 64, not marked isSmall, or via new preferFullMedia), including animated Lottie/video when noPlay would previously keep the preview.
• Tiny list/inline emoji (isSmall and size < 64) still use preview for performance.
• Addresses blurry fullscreen / large custom-emoji display reported in Fullscreen / media-viewer animated custom emoji is blurry (low-res thumbnail upscaled) #538.

Fixes #538
Hyperlinks Space tracking: HyperlinksSpace/HyperlinksSpaceProgram#92

Test plan

• Open a large single animated custom emoji in a chat (and with animated emoji disabled) — should look crisp, not upscaled size=m
• Open sticker / custom-emoji set modal — stickers at modal size should load full media when static or paused
• Scroll a chat with many tiny inline custom emoji — still uses preview path (no obvious perf regression)
• Unsupported video stickers on mobile still fall back to preview

Made with Cursor

[netlify]

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