feat: migrate to modern Google Maps API

CLAUDE.md

@@ -39,6 +39,17 @@ interface MapToolData {
 - `src/vue/View.vue`: Main map display component
 - `src/vue/Preview.vue`: Sidebar preview component
 
+### Google Maps API Usage
+
+This plugin uses modern Google Maps JavaScript API:
+
+- **AdvancedMarkerElement**: For map markers (requires `marker` library and `mapId`)
+- **Place.searchByText**: For place search functionality (new Places API)
+- **Geocoder**: For address-to-coordinates conversion
+- **DirectionsService**: For route calculation
+
+Libraries loaded: `places,marker` with `loading=async`
+
 ## Updating This Document
 
 **IMPORTANT**: When making spec changes or improvements to this plugin through discussion with Claude:

src/core/types.ts

@@ -143,6 +143,8 @@ export interface DirectionStep {
   distance: string;
   duration: string;
   travelMode: string;
+  startLocation?: LatLng;
+  endLocation?: LatLng;
 }
 
 // Route information from Directions API