Have fixed chip width, update calculateUrgency function

[g-lee2]

Description

-Add width to chips
-Fix calculateUrgency so it includes cases that don't have daysUntilNextPurchase or have not been purchased yet

Related Issue

closes #49

Acceptance Criteria

• Fix width of Item Chips to be a consistent size
• Fix calculateUrgency so it includes cases that don't have daysUntilNextPurchase or have not been purchased yet

Type of Changes

	Type
✓	✨ Enhancements
✓	✨ Bug Fix

Updates

Before

After

Testing Steps / QA Criteria

• From your terminal, pull down this branch with git pull origin gl-designand check that branch out with git checkout gl-design
• Run npm start in your terminal
• Click on any shopping list, and view changes to chips

[github-actions]

Visit the preview URL for this PR (updated for commit fe55ee1):

https://tcl-70-smart-shopping-list--pr56-gl-design-9dw9rb8t.web.app

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