fix: add file existence check and improve error logging

- Add FileExists check to prevent runtime errors on missing files
- Add detailed error logging when file read operations fail

Author: damienbutt

src/mConfigFromFile.axs

@@ -100,12 +100,20 @@ define_function GetConfig(char path[]) {
         return
     }
 
+    // Check if file exists
+    if (!NAVFileExists(path)) {
+        NAVLog("'mConfigFromFile => File does not exist at path: ', path")
+        return
+    }
+
     result = NAVFileRead(path, data)
 
     if (result <= 0) {
+        NAVLog("'mConfigFromFile => File read failed for path: ', path, ' (Error: ', NAVGetFileError(result), ')'")
         return
     }
 
+    // If read was successful, the result is the total bytes read
     total = type_cast(result)
 
     NAVLog("'mConfigFromFile => Total Bytes Read: ', itoa(total)")