feat: Add About and Favourites pages, update routing and context management

- Added new routes for About and Favourites pages.
- Implemented About page with version information and credits.
- Created Favourites page with a placeholder message for empty favourites.
- Refactored RegionConfig import paths for consistency.
- Introduced PageTitleContext to manage page titles dynamically.
- Updated various components to utilize the new context for setting page titles.
- Enhanced AppShell layout with a responsive Drawer for navigation.
- Added CSS styles for new components and pages.
- Integrated commit hash display in the About page for version tracking.

1 files changed, 151 insertions, 0 deletions

diff --git a/src/frontend/app/contexts/MapContext.tsx b/src/frontend/app/contexts/MapContext.tsx
new file mode 100644
index 0000000..b47b67f
--- /dev/null
+++ b/src/frontend/app/contexts/MapContext.tsx
@@ -0,0 +1,151 @@
+import { type LngLatLike } from "maplibre-gl";
+import {
+    createContext,
+    useContext,
+    useEffect,
+    useState,
+    type ReactNode,
+} from "react";
+import { getRegionConfig } from "../config/RegionConfig";
+import { useSettings } from "./SettingsContext";
+
+interface MapState {
+  center: LngLatLike;
+  zoom: number;
+  userLocation: LngLatLike | null;
+  hasLocationPermission: boolean;
+}
+
+interface MapContextProps {
+  mapState: MapState;
+  setMapCenter: (center: LngLatLike) => void;
+  setMapZoom: (zoom: number) => void;
+  setUserLocation: (location: LngLatLike | null) => void;
+  setLocationPermission: (hasPermission: boolean) => void;
+  updateMapState: (center: LngLatLike, zoom: number) => void;
+}
+
+const MapContext = createContext<MapContextProps | undefined>(undefined);
+
+export const MapProvider = ({ children }: { children: ReactNode }) => {
+  const { region } = useSettings();
+  const [prevRegion, setPrevRegion] = useState(region);
+
+  const [mapState, setMapState] = useState<MapState>(() => {
+    const savedMapState = localStorage.getItem("mapState");
+    if (savedMapState) {
+      try {
+        const parsed = JSON.parse(savedMapState);
+        // Validate that the saved center is valid if needed, or just trust it.
+        // We might want to ensure we have a fallback if the region changed while the app was closed?
+        // But for now, let's stick to the existing logic.
+        const regionConfig = getRegionConfig(region);
+        return {
+          center: parsed.center || regionConfig.defaultCenter,
+          zoom: parsed.zoom || regionConfig.defaultZoom,
+          userLocation: parsed.userLocation || null,
+          hasLocationPermission: parsed.hasLocationPermission || false,
+        };
+      } catch (e) {
+        console.error("Error parsing saved map state", e);
+      }
+    }
+    const regionConfig = getRegionConfig(region);
+    return {
+      center: regionConfig.defaultCenter,
+      zoom: regionConfig.defaultZoom,
+      userLocation: null,
+      hasLocationPermission: false,
+    };
+  });
+
+  const setMapCenter = (center: LngLatLike) => {
+    setMapState((prev) => {
+      const newState = { ...prev, center };
+      localStorage.setItem("mapState", JSON.stringify(newState));
+      return newState;
+    });
+  };
+
+  const setMapZoom = (zoom: number) => {
+    setMapState((prev) => {
+      const newState = { ...prev, zoom };
+      localStorage.setItem("mapState", JSON.stringify(newState));
+      return newState;
+    });
+  };
+
+  const setUserLocation = (userLocation: LngLatLike | null) => {
+    setMapState((prev) => {
+      const newState = { ...prev, userLocation };
+      localStorage.setItem("mapState", JSON.stringify(newState));
+      return newState;
+    });
+  };
+
+  const setLocationPermission = (hasLocationPermission: boolean) => {
+    setMapState((prev) => {
+      const newState = { ...prev, hasLocationPermission };
+      localStorage.setItem("mapState", JSON.stringify(newState));
+      return newState;
+    });
+  };
+
+  const updateMapState = (center: LngLatLike, zoom: number) => {
+    setMapState((prev) => {
+      const newState = { ...prev, center, zoom };
+      localStorage.setItem("mapState", JSON.stringify(newState));
+      return newState;
+    });
+  };
+
+  // Sync map state when region changes
+  useEffect(() => {
+    if (region !== prevRegion) {
+      const regionConfig = getRegionConfig(region);
+      updateMapState(regionConfig.defaultCenter, regionConfig.defaultZoom);
+      setPrevRegion(region);
+    }
+  }, [region, prevRegion]);
+
+  // Try to get user location on load if permission was granted
+  useEffect(() => {
+    if (mapState.hasLocationPermission && !mapState.userLocation) {
+      if (navigator.geolocation) {
+        navigator.geolocation.getCurrentPosition(
+          (position) => {
+            const { latitude, longitude } = position.coords;
+            setUserLocation([latitude, longitude]);
+          },
+          (error) => {
+            console.error("Error getting location:", error);
+            setLocationPermission(false);
+          }
+        );
+      }
+    }
+  }, [mapState.hasLocationPermission, mapState.userLocation]);
+
+  return (
+    <MapContext.Provider
+      value={{
+        mapState,
+        setMapCenter,
+        setMapZoom,
+        setUserLocation,
+        setLocationPermission,
+        updateMapState,
+      }}
+    >
+      {children}
+    </MapContext.Provider>
+  );
+};
+
+export const useMap = () => {
+  const context = useContext(MapContext);
+  if (!context) {
+    throw new Error("useMap must be used within a MapProvider");
+  }
+  return context;
+};