Implement Schengen Area Compliance Report

How many close am I to 90 days in the last 180.

Fixes #193.

web_view.py

@@ -25,6 +25,7 @@ import agenda.holidays
 import agenda.stats
 import agenda.thespacedevs
 import agenda.trip
+import agenda.trip_schengen
 import agenda.utils
 from agenda import calendar, format_list_with_ampersand, travel, uk_tz
 from agenda.types import StrDict, Trip
@@ -36,6 +37,13 @@ app.config.from_object("config.default")
 agenda.error_mail.setup_error_mail(app)
 
 
+@app.template_filter("country_flag")
+def country_flag_filter(country_code: str) -> str:
+    """Convert country code to emoji flag."""
+    from agenda.schengen import get_country_flag
+    return get_country_flag(country_code)
+
+
 @app.before_request
 def handle_auth() -> None:
     """Handle authentication and set global user."""
@@ -387,11 +395,17 @@ def get_trip_list(
     route_distances: agenda.travel.RouteDistances | None = None,
 ) -> list[Trip]:
     """Get list of trips respecting current authentication status."""
-    return [
+    trips = [
         trip
         for trip in agenda.trip.build_trip_list(route_distances=route_distances)
         if flask.g.user.is_authenticated or not trip.private
     ]
+    
+    # Add Schengen compliance information to each trip
+    for trip in trips:
+        agenda.trip_schengen.add_schengen_compliance_to_trip(trip)
+    
+    return trips
 
 
 @app.route("/trip")
@@ -527,6 +541,9 @@ def trip_page(start: str) -> str:
     prev_trip, trip, next_trip = get_prev_current_and_next_trip(start, trip_list)
     if not trip:
         flask.abort(404)
+    
+    # Add Schengen compliance information
+    trip = agenda.trip_schengen.add_schengen_compliance_to_trip(trip)
 
     coordinates = agenda.trip.collect_trip_coordinates(trip)
     routes = agenda.trip.get_trip_routes(trip, app.config["PERSONAL_DATA"])
@@ -603,6 +620,12 @@ def trip_stats() -> str:
     )
 
 
+@app.route("/schengen")
+def schengen_report() -> str:
+    """Schengen compliance report."""
+    return agenda.trip_schengen.flask_route_schengen_report()
+
+
 @app.route("/callback")
 def auth_callback() -> tuple[str, int] | werkzeug.Response:
     """Process the authentication callback."""