Networking-first rewrite with events in mind

[noahm]

This will be the future form of networking in the app. The whole app uses a shared state that is sync'd between as many users as you see fit. Multiple configuration presets are supported, and users/matches can even be pulled/pushed from a start.gg event. For a more guided tour of all the new features here, see this somewhat outdated video walk-through: https://youtu.be/4Gpj9jTNcfM

The main thing keeping this from merging and replacing our current main branch is the lack of some features that many people still expect, like local-only ITG imports. This can be solved in party by supporting these only in the "classic mode" (no networking) and eventually supporting some sort of external hosting for custom imports.

This PR is perpetually deployed at next.ddr.tools

Current known blockers

• [ ] Support custom/imported data (requires move to separate CDN?)
• [ ] better streamlining for classic mode
• [ ] polished experience for smaller mobile screens

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Project	Deployment	Preview	Updated (UTC)
ddr-tools	Ready	Preview	Nov 9, 2025 2:55pm

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