remaining WWT issues in solara update

[patudom]

• [x] remove chrome (set so it doesn't appear by default then disappear)
• [x] use SDSS as background for stages 1 & 3
• [x] SDSS galaxy table in Stage 1 only seems to load the first time a user accesses the solara app. If a user didn't select all 5 of their galaxies on that first load, there is no way for them to add to their dataset.

[johnarban]

@Carifio24 These should be fixed on https://github.com/nmearl/hubbleds/pull/1 in conjunction with https://github.com/nmearl/ipywwt/pull/4 on @nmearl's branch. These don't use the solara app, but the issues are present in the jupyter version too and stemmed from ipywwt

[Carifio24]

In my testing this all worked well, I didn't see any issues. The only concern that I have is whether or not it's possible for the message from the mounted hook to be emitted before the Python handler is set up. My hunch is that this won't happen, but I couldn't convince myself that it's impossible.

I might try and set up a ping-pong message based version of this, mostly since the fewer deviations we have from the upstream research app the easier the easier this will be to integrate later on. But I think this is fine for now.