fix(map): keep the world-copy fix inside the CI ratchets

Moves the Leaflet map's event bridges (click, context menu, viewport, POI drop
and the longitude-frame follower) out of MapView into leafletMapBridges, and
shares one POI drop target between the Leaflet and GL maps, so both map files
shrink instead of growing. The repair migration does its arithmetic in one
UPDATE per table, and the new tests drop their non-null assertions and loops.

client/src/components/Map/MapViewGL.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useRef, useMemo, useState, useCallback } from 'react'
-import { makeMarkerDraggable, makePoiDraggable, draggedPoiId } from './markerDrag'
+import { makeMarkerDraggable, makePoiDraggable } from './markerDrag'
 import { useStableVias } from './viaMarkerState'
 import { usePlannerWaypointMarkersGL } from './usePlannerWaypointMarkersGL'
 import { carryAssistantMarks, useAssistantMapGL } from './useAssistantMapGL'
@@ -50,6 +50,7 @@ import { pluginsApi, type PluginMapMarker, type PluginMapLayer } from '../../api
 import { DEFAULT_MAP_CENTER, DEFAULT_MAP_ZOOM } from '../../constants/mapDefaults'
 import { alongShortestArc, computeMapViewport, TILE_SIZE_GL } from '../../utils/mapViewport'
 import { onRealWorld } from '../../utils/worldCopy'
+import { bindPoiDropTarget } from './poiDropTarget'
 import { selectedPlaceTarget } from './selectedPlaceTarget'
 import {
   PLACE_CLUSTER_CIRCLE_LAYER_ID, PLACE_CLUSTER_COUNT_LAYER_ID, PLACE_CLUSTER_SOURCE_ID,
@@ -946,35 +947,12 @@ export function MapViewGL({
     }
   }, [mapReady, onRouteClick])
 
-  /**
-   * The map takes the drop, not the drawn route: in a GL renderer the line lives in the
-   * canvas and has no element to aim at. The coordinate under the pointer says just as
-   * much once it is projected onto the routed geometry, and it works the same in all
-   * three renderers.
-   */
+  // A POI dropped on the map lands on the drive (see poiDropTarget.ts).
   useEffect(() => {
     const map = mapRef.current
     const container = map?.getContainer?.()
     if (!container || !mapReady || !onPoiDropOnRoute) return
-    const onDragOver = (e: DragEvent) => {
-      if (!draggedPoiId(e)) return
-      e.preventDefault()
-      if (e.dataTransfer) e.dataTransfer.dropEffect = 'copy'
-    }
-    const onDrop = (e: DragEvent) => {
-      const osmId = draggedPoiId(e)
-      if (!osmId) return
-      e.preventDefault()
-      const rect = container.getBoundingClientRect()
-      const at = onRealWorld(map.unproject([e.clientX - rect.left, e.clientY - rect.top]))
-      onPoiDropOnRoute(osmId, at.lat, at.lng)
-    }
-    container.addEventListener('dragover', onDragOver)
-    container.addEventListener('drop', onDrop)
-    return () => {
-      container.removeEventListener('dragover', onDragOver)
-      container.removeEventListener('drop', onDrop)
-    }
+    return bindPoiDropTarget(container, (x, y) => map.unproject([x, y]), onPoiDropOnRoute)
   }, [mapReady, onPoiDropOnRoute])
   const onViewportChangeRef = useRef(onViewportChange)
   onViewportChangeRef.current = onViewportChange
@@ -1378,7 +1356,6 @@ export function MapViewGL({
       // timer — dedupe so the form doesn't open twice.
       if (Date.now() - lastContextFire < 700) return false
       lastContextFire = Date.now()
-      // A right-click on a repeated world copy still means the place on the real world (#2976).
       onClickRefs.current.context?.({ latlng: onRealWorld({ lat: lngLat.lat, lng: lngLat.lng }), originalEvent })
       return true
     }
@@ -1985,8 +1962,6 @@ export function MapViewGL({
     const fitPoints = routeCoords.length > 0 ? [...routeCoords, ...markerPoints] : markerPoints
     if (fitPoints.length === 0) return
     const bounds = new gl.LngLatBounds()
-    // The short way across the antimeridian, as the focus fit below does: a day
-    // from Los Angeles to Auckland frames the Pacific, not the rest of the world (#2975).
     alongShortestArc(fitPoints).forEach(([lat, lng]) => bounds.extend([lng, lat]))
     let fitted = false
     const run = () => {