Initial commit: Norwegian emergency shelter finder app

Android app (Kotlin) that locates the nearest public shelter (tilfluktsrom)
in Norway. Designed for offline-first emergency use.

Features:
- Downloads and caches all 556 Norwegian shelter locations from Geonorge
- GPS-based nearest shelter finding with distance and bearing
- OSMDroid map with offline tile caching for surroundings
- Large directional compass arrow pointing to selected shelter
- Compass sensor integration for real-time direction updates
- Shows 3 nearest shelters with distance, capacity, and address
- Toggle between map view and compass/arrow view
- Auto-caches map tiles on first launch for offline use
- Weekly background data refresh with manual force-update
- i18n: Norwegian Bokmål, Nynorsk, and English

Technical:
- EPSG:25833 (UTM33N) → WGS84 coordinate conversion
- Haversine distance and bearing calculations
- Room database for shelter persistence
- Fused Location Provider for precise GPS
- Sensor fusion (rotation vector with accel+mag fallback) for compass

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

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+# Tilfluktsrom - Norwegian Emergency Shelter Finder
+
+## Project Overview
+Android app (Kotlin) that helps find the nearest public shelter (tilfluktsrom) in Norway during emergencies. Offline-first design: must work without internet after initial data cache.
+
+## Architecture
+- **Language**: Kotlin, targeting Android API 26+ (Android 8.0+)
+- **Build**: Gradle 8.7, AGP 8.5.2, KSP for Room annotation processing
+- **Maps**: OSMDroid (offline-capable OpenStreetMap)
+- **Database**: Room (SQLite) for shelter data cache
+- **HTTP**: OkHttp for data downloads
+- **Location**: Google Play Services Fused Location Provider
+- **UI**: Traditional Views with ViewBinding
+
+## Key Data Flow
+1. Shelter data downloaded as GeoJSON ZIP from Geonorge (EPSG:25833 UTM33N)
+2. Coordinates converted to WGS84 (lat/lon) via `CoordinateConverter`
+3. Stored in Room database for offline access
+4. Nearest shelters found using Haversine distance calculation
+5. Direction arrow uses device compass bearing minus shelter bearing
+
+## Data Sources
+- **Shelter data**: `https://nedlasting.geonorge.no/geonorge/Samfunnssikkerhet/TilfluktsromOffentlige/GeoJSON/...`
+- **Map tiles**: OpenStreetMap via OSMDroid (auto-cached for offline use)
+
+## Package Structure
+```
+no.naiv.tilfluktsrom/
+├── data/          # Room entities, DAO, repository, GeoJSON parser, map cache
+├── location/      # GPS location provider, nearest shelter finder
+├── ui/            # Custom views (DirectionArrowView), adapters
+└── util/          # Coordinate conversion (UTM→WGS84), distance calculations
+```
+
+## Building
+```bash
+./gradlew assembleDebug
+```
+
+## i18n
+- Default (English): `res/values/strings.xml`
+- Norwegian Bokmål: `res/values-nb/strings.xml`
+- Norwegian Nynorsk: `res/values-nn/strings.xml`