feat: add Resend integration and fix state persistence

Author: NaxeCode

.gitignore

@@ -38,9 +38,7 @@ bld/
 # Environment variables - IMPORTANT: Never commit this!
 .env
 
-# State files
-/data/
-state.json
+# State files (old - see bottom for better pattern)
 
 # OS files
 .DS_Store
@@ -56,3 +54,7 @@ desktop.ini
 # Docker
 .dockerignore
 docker-compose.override.yml
+
+# Data directory - ignore everything except state.json
+data/*
+!data/state.json

StateStore.cs

@@ -3,7 +3,8 @@
 
 public static class StateStore
 {
-    static readonly string PathFile = "/data/state.json";
+    static readonly string DataDir = Environment.GetEnvironmentVariable("DATA_DIR") ?? "./data";
+    static readonly string PathFile = Path.Combine(DataDir, "state.json");
     static readonly JsonSerializerOptions J = new() { WriteIndented = true };
 
     public static StateOfWorld Load()
@@ -14,7 +15,7 @@ public static StateOfWorld Load()
 
     public static void Save(StateOfWorld s)
     {
-        Directory.CreateDirectory("/data");
+        Directory.CreateDirectory(DataDir);
         File.WriteAllText(PathFile, JsonSerializer.Serialize(s, J));
     }