Minor nits

[pcuenca]

A few suggestions, absolutely not critical.

• The initial message mentions a + icon that does not exist.
• I'd maybe select the Point tool by default.
• Maybe deselect previous masks when the user refines with a new input?

Maybe slightly more important:

• The first time models are loaded we get a spinner. Everything works super fast on subsequent runs.

[cyrilzakka]

• [x] The initial message mentions a + icon that does not exist.
• [x] I'd maybe select the Point tool by default.
• [ ] Maybe deselect previous masks when the user refines with a new input? Would you mind just clarifying what you mean by the last point? What masks should be deselected?

[pcuenca]

When a new point is added and a new mask generated, maybe hide the previous one? Not sure though.

[cyrilzakka]

• [x] Maybe deselect previous masks when the user refines with a new input?