feat: Ensure stone layer chunks always render and remain visible

js/main.js

@@ -78,6 +78,15 @@ function simulationLoop(timestamp) {
     // Update physics with timestamp for rate limiting
     updatePhysics(timestamp);
     
+    // Force stone layer chunks to be rendered every frame
+    const visibleChunks = getVisibleChunks();
+    for (const { chunkX, chunkY, isVisible } of visibleChunks) {
+        if (isVisible && chunkY === 1) {
+            // Mark stone layer chunks as dirty to ensure they're always rendered
+            dirtyChunks.add(getChunkKey(chunkX, chunkY));
+        }
+    }
+    
     // Render
     render();
     

js/render.js

@@ -13,8 +13,9 @@ function render() {
         
         const key = getChunkKey(chunkX, chunkY);
         
-        // Skip rendering if the chunk hasn't changed and isn't marked as dirty
-        if (!dirtyChunks.has(key) && !worldMoved) {
+        // Always render stone layer (chunkY = 1) chunks, even if they're not dirty
+        // For other chunks, only render if they're dirty or the world moved
+        if (chunkY !== 1 && !dirtyChunks.has(key) && !worldMoved) {
             continue;
         }
         

js/world.js

@@ -527,9 +527,14 @@ function generateChunksAroundPlayer() {
         const chunkY = 1; // The chunk at y = 1 (moved from y = -1)
         const key = getChunkKey(chunkX, chunkY);
         
-        // Always generate and mark as dirty to ensure rendering
+        // Always generate stone layer chunks
         getOrCreateChunk(chunkX, chunkY);
-        dirtyChunks.add(key);
+        
+        // Mark as dirty only if it's a new chunk or if it's visible
+        if (!chunks.has(key) || visibleChunks.some(chunk => 
+            chunk.chunkX === chunkX && chunk.chunkY === chunkY && chunk.isVisible)) {
+            dirtyChunks.add(key);
+        }
     }
     
     // Generate visible chunks first