418 element view UI

[NateLanza]

Does this PR close any open issues?

Closes #418

Give a longer description of what this PR addresses and why it's needed

• Pads the bottom of the Element View so that the table controls don't overflow
• Makes the 'Element View' h2 title larger than the h3 subtitles below
• Allows deselecting the current intersection & current element selection by clicking their pills, even if they aren't bookmarked (this was previously implemented for bookmarked chips)
• Allows deselecting the current intersection in the plot by clicking any element within SvgBase that doesn't have a different click handler

Provide pictures/videos of the behavior before and after these changes (optional)

Before:

After:

Have you added or updated relevant tests?

• Yes
• No changes are needed

Have you added or updated relevant documentation?

• Yes
• No changes are needed

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[NateLanza]

@JakeWags Do you have a click handler somewhere other than SvgBase that's supposed to deselect the current intersection? If so, that should probably be removed given the new handler.

[JakeWags]

Looks good. Check for additional click handlers that exist in the SVG Base element before merging.

[JakeWags]

I've tried to figure this out and I agree. Somewhat of a mystery...