refactor: Improve OverworldEditor File Handling and Code Clarity

- Added file utility header for improved resource path management.
- Enhanced ASM file handling by utilizing GetResourcePath for better compatibility across deployment scenarios.
- Cleaned up code formatting and comments for clarity, ensuring consistent indentation and readability.
- Deprecated feature flag for ZSCustomOverworld ASM application, simplifying the logic for version gating.

src/app/editor/overworld/overworld_editor.cc

@@ -34,6 +34,7 @@
 #include "app/zelda3/overworld/overworld_map.h"
 #include "imgui/imgui.h"
 #include "imgui_memory_editor.h"
+#include "util/file_util.h"
 #include "util/hex.h"
 #include "util/log.h"
 #include "util/macro.h"
@@ -2453,10 +2454,8 @@ absl::Status OverworldEditor::Clear() {
 }
 
 absl::Status OverworldEditor::ApplyZSCustomOverworldASM(int target_version) {
-  if (!core::FeatureFlags::get().overworld.kApplyZSCustomOverworldASM) {
-    return absl::FailedPreconditionError(
-        "ZSCustomOverworld ASM application is disabled in feature flags");
-  }
+  // Feature flag deprecated - ROM version gating is sufficient
+  // User explicitly clicked upgrade button, so respect their request
 
   // Validate target version
   if (target_version < 2 || target_version > 3) {
@@ -2483,18 +2482,23 @@ absl::Status OverworldEditor::ApplyZSCustomOverworldASM(int target_version) {
   std::vector<uint8_t> working_rom_data = original_rom_data;
 
   try {
-    // Determine which ASM file to apply
-    std::string asm_file_path;
-    if (target_version == 3) {
-      asm_file_path = "assets/asm/yaze.asm";  // Master file with v3
-    } else {
-      asm_file_path = "assets/asm/ZSCustomOverworld.asm";  // v2 standalone
-    }
+    // Determine which ASM file to apply and use GetResourcePath for proper resolution
+    std::string asm_file_name = (target_version == 3) 
+        ? "asm/yaze.asm"              // Master file with v3
+        : "asm/ZSCustomOverworld.asm";  // v2 standalone
     
-    // Check if ASM file exists
+    // Use GetResourcePath to handle app bundles and various deployment scenarios
+    std::string asm_file_path = util::GetResourcePath(asm_file_name);
+    
+    LOG_INFO("OverworldEditor", "Using ASM file: %s", asm_file_path.c_str());
+    
+    // Verify file exists
     if (!std::filesystem::exists(asm_file_path)) {
-      return absl::NotFoundError(
-          absl::StrFormat("ASM file not found: %s", asm_file_path));
+      return absl::NotFoundError(absl::StrFormat(
+          "ASM file not found at: %s\n\n"
+          "Expected location: assets/%s\n"
+          "Make sure the assets directory is accessible.",
+          asm_file_path, asm_file_name));
     }
 
     // Apply the ASM patch