Add shortcode zoom and rotation #68
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This change adds two new optional shortcode attributes to control the initial map view:
zoom: Sets the initial zoom level. Use -1 (default) to auto-fit the track bounds; any other number forces that zoom level after fitting.
rotation: Sets the initial map rotation in degrees (clockwise). This is applied only when the MapBox engine is used (i.e., when a MapBox API key is configured).
Implementation details:
PHP (wp-gpx-maps.php) reads zoom/rotation from the shortcode and passes them to the JS constructor as numeric zoomLevel and rotationDegree.
Frontend TS/JS updates (assets/src/*) plumb these parameters into the map engines.
MapBox engine applies both setZoom() and rotateTo(); Leaflet applies setZoom() only (Leaflet rotation is not supported here).
Help tab (wp-gpx-maps-help.php) documents the new options so they appear under Settings → WP-GPX-Maps → Help.