Fix resource leaks, bounds checks, and missing @Override annotations

src/main/java/com/altnoir/mia/block/entity/AbyssSpawnerBlockEntity.java

@@ -109,6 +109,7 @@ public void setPatternId(@Nullable ResourceLocation patternId) {
     }
 
     @Nullable
+    @Override
     public ResourceLocation getPatternId() {
         return this.patternId;
     }
@@ -125,10 +126,12 @@ public void refreshPattern() {
     }
 
     @Nullable
+    @Override
     public AbyssTrialSpawnerPattern getPattern() {
         return this.cachedPattern;
     }
 
+    @Override
     public boolean hasValidPattern() {
         return this.cachedPattern != null;
     }

src/main/java/com/altnoir/mia/core/spawner/AbyssTrialSpawnerManager.java

@@ -56,8 +56,8 @@ public AbyssTrialSpawnerManager() {
                 var fixedLoc = ResourceLocation.fromNamespaceAndPath(namespace, parts[0]);
                 var res = entry.getValue();
 
-                try (var stream = res.open()) {
-                    var json = GsonHelper.fromJson(GSON, new InputStreamReader(stream), JsonElement.class);
+                try (var stream = res.open(); var reader = new InputStreamReader(stream)) {
+                    var json = GsonHelper.fromJson(GSON, reader, JsonElement.class);
                     result.put(fixedLoc, json);
                 } catch (IOException | JsonParseException e) {
                     LOGGER.error("Failed to load trial spawner JSON from {}", fileLoc, e);

src/main/java/com/altnoir/mia/util/MiaUtil.java

@@ -222,6 +222,11 @@ public static boolean isCreativeOrSpectator(Player player) {
             return null;
         }
 
+        // Ensure there is at least one character after basePath before substring
+        if (filePath.length() <= basePath.length()) {
+            return null;
+        }
+
         var trimmedPath = filePath.substring(basePath.length() + 1);
         if (trimmedPath.endsWith(".json")) {
             trimmedPath = trimmedPath.substring(0, trimmedPath.length() - 5);