[Analytics Hub] Requested design enhancements

[rachelmcr]

The following Analytics Hub design enhancements were identified in a design review after the Expanded Analytics Hub release:

### Tasks
- [ ] Confirm percentage badge doesn't max out at 100%
- [ ] 24pt gap between badge and chart
- [ ] Adjust analytics card vertical spacing
- [ ] Extend divider between items on Products/Bundles card to screen right edge
- [ ] Don’t bold the headings on Products/Bundles card
- [ ] Change red icon to grey when Sessions card can't be displayed
- [ ] On customize screen, bottom border disappears from row for a moment after dropping
- [ ] On customize screen, add full width bottom border at bottom of list
- [ ] Update card style to match My Store design: pe5sF9-2DL-p2#changes-to-my-store

See discussion (including link to Figma file): pe5pgL-4pB-p2#comment-3998

[dangermattic]

Thanks for reporting! 👍