fix(map): harden globe projection switch and overlay teardown

apps/web/src/widgets/map3d/Map3D.tsx

@@ -126,6 +126,16 @@ function onMapStyleReady(map: maplibregl.Map, callback: () => void) {
   };
 }
 
+function extractProjectionType(map: maplibregl.Map): MapProjectionId | undefined {
+  const projection = map.getProjection?.();
+  if (!projection || typeof projection !== "object") return undefined;
+
+  const rawType = (projection as { type?: unknown; name?: unknown }).type ?? (projection as { type?: unknown; name?: unknown }).name;
+  if (rawType === "globe") return "globe";
+  if (rawType === "mercator") return "mercator";
+  return undefined;
+}
+
 const DEG2RAD = Math.PI / 180;
 
 const clampNumber = (value: number, minValue: number, maxValue: number) => Math.max(minValue, Math.min(maxValue, value));
@@ -724,9 +734,38 @@ export function Map3D({
     let retries = 0;
     const maxRetries = 18;
 
-    const getCurrentProjection = () => {
-      const projectionConfig = map.getProjection?.();
-      return projectionConfig && "type" in projectionConfig ? (projectionConfig.type as MapProjectionId | undefined) : undefined;
+    const disposeMercatorOverlay = () => {
+      const current = overlayRef.current;
+      if (!current) return;
+      try {
+        map.removeControl(current as never);
+      } catch {
+        // ignore
+      }
+      try {
+        current.finalize();
+      } catch {
+        // ignore
+      }
+      overlayRef.current = null;
+    };
+
+    const disposeGlobeDeckLayer = () => {
+      const current = globeDeckLayerRef.current;
+      if (!current) return;
+      if (map.getLayer(current.id)) {
+        try {
+          map.removeLayer(current.id);
+        } catch {
+          // ignore
+        }
+      }
+      try {
+        current.requestFinalize();
+      } catch {
+        // ignore
+      }
+      globeDeckLayerRef.current = null;
     };
 
     const syncProjectionAndDeck = () => {
@@ -741,11 +780,21 @@ export function Map3D({
       }
 
       const next = projection;
+      const currentProjection = extractProjectionType(map);
+      const shouldSwitchProjection = currentProjection !== next;
+
       try {
-        if (getCurrentProjection() !== next) {
+        if (shouldSwitchProjection) {
           map.setProjection({ type: next });
         }
         map.setRenderWorldCopies(next !== "globe");
+        if (shouldSwitchProjection) {
+          if (!cancelled && retries < maxRetries) {
+            retries += 1;
+            window.requestAnimationFrame(() => syncProjectionAndDeck());
+            return;
+          }
+        }
       } catch (e) {
         if (!cancelled && retries < maxRetries) {
           retries += 1;
@@ -758,25 +807,12 @@ export function Map3D({
       const oldOverlay = overlayRef.current;
       if (projection === "globe" && oldOverlay) {
         // Globe mode uses custom MapLibre deck layers and should fully replace Mercator overlays.
-        try {
-          oldOverlay.finalize();
-        } catch {
-          // ignore
-        }
-        overlayRef.current = null;
+        disposeMercatorOverlay();
       }
 
       if (projection === "globe") {
-        // Ensure any stale layer from old mode is dropped then re-added on this projection.
-        if (globeDeckLayerRef.current) {
-          try {
-            if (map.getLayer(globeDeckLayerRef.current.id)) {
-              map.removeLayer(globeDeckLayerRef.current.id);
-            }
-          } catch {
-            // ignore
-          }
-        }
+        // Start with a clean globe Deck layer state to avoid partially torn-down renders.
+        disposeGlobeDeckLayer();
 
         if (!globeDeckLayerRef.current) {
           globeDeckLayerRef.current = new MaplibreDeckCustomLayer({
@@ -801,15 +837,7 @@ export function Map3D({
         }
       } else {
         // Tear down globe custom layer (if present), restore MapboxOverlay interleaved.
-        const globeLayer = globeDeckLayerRef.current;
-        if (globeLayer && map.getLayer(globeLayer.id)) {
-          try {
-            globeLayer.requestFinalize();
-            map.removeLayer(globeLayer.id);
-          } catch {
-            // ignore
-          }
-        }
+        disposeGlobeDeckLayer();
 
         if (!overlayRef.current) {
           try {