Allow view side focusing

[josh-ja-walker]

• Only expand hovered view button, not all
• Reduce delay in expanding view buttons
• When expanded, show arrow to open in right panel
• Update sidepanel style (keep height of main panel not incl. tabs reduce padding, move header above panel, etc.)
• Add close button to sidepanel
• Move special sidepanels to left of view buttons (i.e., state should be with settings)
• Possibly make state/settings into a view panel