Fix findShardForGlobalIndex method

Author: SomeGuyWhoLovesCoding

src/data/chart/chart_file_core.cpp

@@ -390,19 +390,6 @@ class ShardedChartReader {
         }
     }
 
-    uint64_t findShardForGlobalIndex(int64_t globalIndex) const {
-        if (globalIndex < 0 || globalIndex >= totalNotes) {
-            throw std::out_of_range("Global index out of range: " + std::to_string(globalIndex));
-        }
-        
-        auto it = std::upper_bound(shardStartIndices.begin(), shardStartIndices.end(), globalIndex);
-        if (it == shardStartIndices.begin()) {
-            throw std::runtime_error("Invalid shard lookup");
-        }
-        
-        size_t shardPos = std::distance(shardStartIndices.begin(), it) - 1;
-        return availableShards[shardPos];
-    }
 
 public:
     ShardedChartReader(const char* path) : chartDir(path) {
@@ -425,6 +412,20 @@ class ShardedChartReader {
         activeShards.clear();
         currentShard = nullptr;
     }
+
+    uint64_t findShardForGlobalIndex(int64_t globalIndex) const {
+        if (globalIndex < 0 || globalIndex >= totalNotes) {
+            throw std::out_of_range("Global index out of range: " + std::to_string(globalIndex));
+        }
+        
+        auto it = std::upper_bound(shardStartIndices.begin(), shardStartIndices.end(), globalIndex);
+        if (it == shardStartIndices.begin()) {
+            throw std::runtime_error("Invalid shard lookup");
+        }
+        
+        size_t shardPos = std::distance(shardStartIndices.begin(), it) - 1;
+        return availableShards[shardPos];
+    }
 
     inline uint64_t getNote(int64_t globalIndex) {
         // Fast path: same shard as last access