FBP Go: Polygon Map on Fire Perimeters

**Describe the task**

User requested: Polygon Map on Fire Perimeters (PO is aware)

**Acceptance Criteria**
- [ ] first
- [ ] second
- [ ] third

**Additional context**
- Add any other context about the task here.
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The issue does not name any files, tests, or entry points, and its acceptance criteria are placeholders. Start by clarifying the intended polygon map behavior with the product owner, then locate the existing fire-perimeter map flow. Done should mean the three acceptance criteria are replaced with verifiable requirements and the polygon map behavior is implemented and checked.

Written by the indexing model from the issue text.