Symptoms: Improve activity scale visualization

How it works now

• Users rate a symptom's activity on a five step scale, represented by a smiley face and four squares
• There are hover tooltips, but on iOS, these are are only visible after touching one of the options
• If a square is selected, that square and all squares to the left of it fill in with a random color
• The smiley face only fills in if it is selected

User story
As someone with a chronic illness, who is trying to track their health in the Flaredown iOS app, I would like to rate my symptoms' activity without confusion. The scale is confusing because:

1. The rating options don't have an explanation, so I don't know what the rating options are before I touch one
2. The smiley face doesn't match the square pattern, so I didn't think it was a rating option
3. The smiley face doesn't match the color pattern, so I didn't think it was a rating option

How it should work - TO BE DETERMINED

• The scale should still be the standard 1-5 symptom activity scale (note: does this have a name???)