feat: show child area boundaries as a filled polygon

[vnugent]

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name: Pull request about: Create a pull request title: '' labels: '' assignees: ''

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What type of PR is this?(check all applicable)

• [ ] refactor
• [x] feature
• [ ] bug fix
• [ ] documentation
• [ ] optimization
• [ ] other

Description

Related Issues

Issue #1060

What this PR achieves

For a given area use its child areas' bbox to calculate a polygon (convex hull).

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Name	Status	Preview	Updated (UTC)
open-tacos	✅ Ready (Inspect)	Visit Preview	Jan 6, 2024 5:41pm