- Add parse_coordinate() function to handle both decimal degrees and DMS format
- Replace direct float() conversion with robust coordinate parsing
- Add proper validation for latitude/longitude ranges
- Create user-friendly error page instead of showing stack traces
- Support formats like "56°5'58.56"N" and "3°22'33.71"W"
- Update both /detail and / routes with improved error handling
Fixes#29: Don't return stack trace when lat/lon are not integers
