2026.3.25.1356 - User Registration refactor, bugfixes, Unity SDK updates — Resonite Steam update #1113501

Hello everyone! I've got another build for you! This has mostly some small bugfixes it the client itself, but also matching big refactor of user registration process in the cloud by @Gawdl3y! He has reworked how the cloud handles registration to make it significantly more robust, preventing cases of users who would end up with incomplete accounts when registering, requiring a support ticket to handle this. This has been in works for a while and should avoid common onboarding issue that a chunk of new users hit. Compatible with current. However registering user accounts might not work with older builds. Fixes: - Heavily refactored the user registration process in the cloud, improving it to be more robust, scalable, and consistent across methods of registration (implemented by @Gawdl3y) -- This should resolve cases where users were registered but stuck in an invalid state, such as with mis...