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* fix(studio-server): keep transparency in proxies of VP8/VP9 alpha webm A webm whose alpha lives in the VP8/VP9 side channel (alpha_mode=1, pix_fmt yuv420p) was proxied to opaque H.264, and the VP8 proxy path decoded it with ffmpeg's native decoder, which drops alpha. The alpha rule and the alpha-reading decoder now live once in @hyperframes/parsers/media-alpha, used by engine and studio-server. * build(parsers): raise the packed size budget for the media-alpha subpath parsers already sat at its packed budget on main; the shared alpha rule adds 676 B of JS and 803 B of declarations (190958 B packed in CI).