Lohnt sich dein eigenes HuntStand?

Build a personal, offline-first hunting scouting map as a PWA. No accounts, no server, no telemetry. All data stays on the device.

Stack, no substitutions:
- Vite + React + TypeScript
- MapLibre GL JS for the map
- Dexie (IndexedDB) for all storage
- vite-plugin-pwa for installability and tile caching
- Tailwind for styling, keep it plain and thumb-friendly

Map:
- Base layers switchable: satellite and topo from MapTiler using VITE_MAPTILER_KEY from .env, plus an OpenStreetMap raster fallback that needs no key
- "Download this area" button: prefetch tiles for the current viewport at zoom 12 to 16 into the service worker cache, show progress and cache size, allow clearing

Data model in Dexie: properties (name, GeoJSON polygon, acres computed), markers (type: stand, blind, camera, plot, trail cam, gate, sign, custom; lat, lng, notes, photo blob), tracks (recorded GPS line, timestamps), sits (marker id, start, end, wind dir and speed, temp, moon phase, sightings list with species, count, sex, time, free notes).

Features:
- Tap map to add a marker, choose type from an icon grid, attach a photo from the camera input
- Draw or import property polygons: file import for GeoJSON, KML and GPX, since county GIS portals hand those out. Show acreage.
- Record a walk: watchPosition into a track, works with screen on, stop and save
- Wind overlay: fetch current and hourly wind direction and speed from Open-Meteo for the map center, draw an arrow and a compass rose, and shade a simple downwind cone from any selected stand so it is obvious which stands are burned today
- Sunrise, sunset and moon phase computed locally with suncalc, no API
- Sit log: start a sit from a stand marker, it snapshots wind, temp and moon, then log sightings as you go
- Export and import everything as one JSON file, plus GeoJSON export of markers and tracks

Explicitly out of scope: parcel boundaries or landowner names (no legal source to pull from, the user imports their own), multi-user sharing, sync, push notifications, deer movement predictions.

Seed with two example markers and a sample property polygon so the UI is not empty. Write a README that states plainly what it does not do.