Simpler nav guard for SideModalForm #2328
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This adds a modal for the SideModalForm that protects it from getting accidentally closed when the form is dirty.
I had experimented with a more involved approach, using useBlocker, but as Crespo and I were talking through it, he noted that side modal forms don't always require a route change, so this is possibly both more reliable and simpler.
The deeper question: is the benefit of adding this bit of friction worth it? I'm leaning towards "yes", as the friction is pretty minimal and the potential for data loss is … low-to-moderate? … but am open to alternate takes.
Fixes #2186