zenojunior/cs2d — reverse-engineered prompt

Build me a fast browser based 2D replay viewer for Counter Strike 2 demos. I want to drag in a demo file and instantly watch the match round by round, with player movement, kills, timing, scoreboard, killfeed, chat, and smooth auto advance between rounds. It needs to work fully offline in the browser, with parsing done locally so nothing ever gets uploaded. Please support normal demo files plus common compressed ones like gz, zip, and zst.

I also want analysis tools that make it useful for reviewing games with friends, heatmaps for deaths, presence, and utility, grenade trajectories with a way to jump into the replay from a throw, utility stats like flash effectiveness and HE or molotov damage, and economy info by round. Add a map drawing tool, comments on specific moments, local history in the browser, and export and import of analyzed matches so reopening is instant. If possible, include replayed player comms and a clean multi language UI. Look up current docs online if you need to.