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Adds a «POI» checkbox to the terrain popup that toggles the poi-circles and poi-labels layers via map.setLayoutProperty. The choice is persisted in localStorage (key `poi-visible`) and restored on page load and after style changes, kept consistent with the runtime layerState.poi per ADR-0001. Tests: behavioral JS unit tests (TP-01..TP-04) run via `node --test`, wrapped by tests/unit/test_poi_toggle.py with static structure checks so they execute under the existing `pytest tests/` CI step. Refs: ET-002 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>