Fast forward fix is live :)

What caused it to break? Along with adding offline support I also migrated the build system from Webpack to Vite. I did this for 2 reasons. I wanted to add TS support and the Vue CLI Plugin for TS which uses Webpack has been put in maintenance mode. Vite is the recommended build system for Vue 3 which I plan to upgrade to at some point in the future.

The fast-forward code uses a function called setImmediate which needs to be polyfilled in browsers. I needed to add the polyfill manually  :)