feat: Enhance turtle management by broadcasting removal notifications and cleaning up stale turtles

client/src/store/turtleStore.js

@@ -49,11 +49,21 @@ export const useTurtleStore = create((set, get) => ({
           if (data.turtle.surroundings && data.turtle.position && data.turtle.facing !== undefined) {
             get().updateBlocksFromSurroundings(data.turtle);
           }
-        } else if (data.type === 'turtle_disconnected') {
+        } else if (data.type === 'turtle_removed' || data.type === 'turtle_disconnected') {
+          console.log(`🔌 Turtle ${data.turtleID} removed`);
           set(state => {
             const newTurtles = { ...state.turtles };
             delete newTurtles[data.turtleID];
-            return { turtles: newTurtles };
+            
+            // If the removed turtle was selected, deselect it
+            const newSelectedId = state.selectedTurtleId === data.turtleID 
+              ? null 
+              : state.selectedTurtleId;
+            
+            return { 
+              turtles: newTurtles,
+              selectedTurtleId: newSelectedId
+            };
           });
         }
       } catch (error) {