This needs a nice favicon, and I have no idea what it should look like, except maybe it should suggest a wormhole.

The "Share Plan" button will generate a link to share the plan with other players, allowing players to send a link to their current plan to make coordination easier. When an end user clicks on a shared plan link, the app should deserialize the URL search params and set the application state to the shared state.

A user can click on a button to copy their plan to share with another user.

Potential URL Schema 1

?sig=<str:sig>&shipNames=<str[]:names>&shipCold=<int[]:coldMass>&shipHot=<int[]:hotMass>&shipColor=<str[]:shipColor>&isThreader=<bool[]:threader>

This has the benefit of being relatively easily editable by end users.

Potential URL Schema 2

?sig=<str:sig>&ships=<str:jsonEncodedShips>

This has the benefit of being relatively easy to implement, but you have to URL encode after serializing, and URL decode when deserializing the data.

Potential URL Schema 3

?sig=<str:sig>&ships=<str:b64EncodedShips>

This has the benefit of potentially being very compact, but has the downside of being hard to edit by end users and you have to write a custom save format.

This isn't super important, but it does bother me.

A user should be able to save ship configurations that they commonly use, so that they don't have to enter ship masses repeatedly.

Ship masses should be able to be saved and selected quickly (in a drop-down menu or similar) so that end users don't have to add ship masses every time them use the tool. This functionality should survive past page refreshes, and we may need one of those cookie compliance banners.