chore(ui): Object viewer expand/collapse button simplification

[m-rgba]

Description

• Simplified object viewer buttons to use one button for collapse / expand.
• Show / hide functionality for clicking the header to hide/show the object viewer.
• Adjusted the sizing of the header for the object viewer.
• Adjusted padding for the object viewer in the calls panel.

Screenshot

Before	After

[circle-job-mirror]

Preview this PR with FeatureBee: https://beta.wandb.ai/?betaVersion=a196e0cccd969a3b9d1a916442b7dc1d0956e283

[m-rgba]

Updated preview:
https://beta.wandb.ai/?betaVersion=2d72424eebbc1a0442a57445f93b361949321550

[gtarpenning]

I think this makes sense, I like the icon change. One micro tioli style suggestion.

Note: This will change our users experience of the object flow, they might go looking for this button we have removed.

Also, not your problem, but the object viewer not auto resizing after collapse is annoying

[gtarpenning]

total nit but i've been thinking that 1 liner functions are more aesthetic than I previously thought, we might consider adding a local isModeHidden fn like:

function isModeHidden(mode) {
   return mode === 'hidden'
}
function isModeExpanded...

[gtarpenning]

and then obviously use it everywhere we test the mode state

[m-rgba]

I think this makes sense, I like the icon change. One micro tioli style suggestion.

Note: This will change our users experience of the object flow, they might go looking for this button we have removed.

Also, not your problem, but the object viewer not auto resizing after collapse is annoying !

For sure - I thought it was an acceptable level of moving the cheese since we use the title collapse elsewhere for the entire viewer, and the collapse/expand buttons being separate buttons when they're really a toggle was kind of an anti-pattern and was cluttering it up.

Yeah I saw the height re-size as well but I thought it may be better for a separate PR cause I know there was some stuff around setting the explicit height and virtualization to take into account.