Source Copenhagen transit data from Rejseplanen GTFS

- Replace OSM Overpass transit data with the Rejseplanen GTFS feed
  (routes keyed by (agency, short name); styles from modes.yaml)
- Draw one shape per (style, ref, direction), choosing the shape that
  serves the most in-area stops so lines pass the stops we show
- Collapse stops by names (verified unambiguous); prune stops whose
  serving refs have no drawn line within 300 m
- Patch Københavns Havn + Nordhavn into the area polygon so ferry
  routes and sub-harbour metro tunnels survive clipping; 100 m buffer
  closes relation boundary slivers
- Drop OSM download pipeline; keep tiled basemap

copenhagen/config/styling.yaml

@@ -4,13 +4,15 @@
 
 zorder:
   bus: 1
-  s_tog: 2
-  light_rail: 3
-  regional: 4
-  metro: 5
+  ferry: 2
+  s_tog: 3
+  light_rail: 4
+  regional: 5
+  metro: 6
 
 line_width:           # body width in points (outline = body + outline_width)
   bus: 0.8
+  ferry: 1.4
   s_tog: 2.0
   light_rail: 2.0
   regional: 1.8
@@ -21,14 +23,16 @@ outline_color: "#2b2b2b"
 
 alpha:
   bus: 0.45
+  ferry: 1.0
   s_tog: 0.95
   light_rail: 0.95
   regional: 0.9
   metro: 1.0
 
-# Fallback palette when no GTFS route_color and no OSM colour tag are present.
-# Metro / S-tog values mirror the OSM colour tags (verified). Regional trains
-# have no OSM colour, so the palette supplies one.
+# Line colours. The Rejseplanen GTFS feed leaves route_color empty for the
+# Copenhagen operators, so in practice everything resolves to this palette.
+# Metro / S-tog values mirror the official line colours; regional trains and
+# the light rail have no operator colour, so the palette supplies one.
 palette:
   metro:
     M1: "#008d41"
@@ -52,6 +56,8 @@ palette:
     C: "#16a085"
     S: "#2a6fb5"
     default: "#c8a80e"
+  ferry:
+    default: "#2aa8e0"   # harbour-bus blue
 
 bus_filters:
   # ref-based bus categorisation (regex applied to route ref)
@@ -73,11 +79,8 @@ basemap:
 stations:
   show: true              # draw station markers (symbols without text)
   styles: [metro, s_tog, regional, bus]
-  stop_cluster_m:          # merge same-name stops within this distance (per mode)
-    metro: 200             # covers platform/entrance spread (~170m max)
-    s_tog: 400             # covers platform/entrance spread (~380m max)
-    regional: 500          # covers platform spread (~475m max)
-    bus: 100               # opposite sides of road, wide boulevards
+  # NOTE: stops/stations arrive pre-collapsed from prepare.py (name-keyed,
+  # one point per stop/station) — no clustering configuration lives here.
   marker:
     shape: circle         # circle | square
     fill: white