- Refactor core.py: replace sys.exit() calls with OsmError exceptions
so the library is safe to use from Flask and other callers
- Add fetch_sibling_routes and fetch_route_master_routes to core.py
- Add Flask web frontend (web/app.py, templates, static assets):
- Map view with Leaflet; full route drawn in grey on load
- Sidebar stop list; active-slot UX for From/To selection
- Segment preview and download (full route or selected segment)
- Include-stops toggle applied client-side
- Bookmarkable URLs: GET /<relation_id>
- Clear selection button
- Other directions panel (sibling routes from same route_master)
- route_master handling: draws all member routes in colour on map
with links to each individual direction
- Add SVG favicon
- Add py.typed marker; add .gitignore
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
