Add toast notification system

Add more toast types

games/htmx_middleware.py

@@ -0,0 +1,59 @@
+import json
+
+from django.contrib import messages as django_messages
+from django.contrib.messages import constants as message_constants
+
+MESSAGE_LEVEL_MAP = {
+    message_constants.DEBUG: "debug",
+    message_constants.INFO: "info",
+    message_constants.SUCCESS: "success",
+    message_constants.WARNING: "warning",
+    message_constants.ERROR: "error",
+}
+
+
+class HTMXMessagesMiddleware:
+    """
+    Converts Django messages into HX-Trigger headers so toasts display
+    automatically without changes to views.
+
+    Works for HTMX requests (processed natively by HTMX client),
+    vanilla fetch() calls using fetchWithHtmxTriggers(), and is harmless
+    for full-page loads (browsers ignore HX-Trigger).
+    """
+
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        response = self.get_response(request)
+
+        # Skip HX-Trigger and don't consume messages if there's an HX-Redirect
+        # so the message persists in the session for the redirect target page
+        if "HX-Redirect" in response:
+            return response
+
+        messages = list(django_messages.get_messages(request))
+        if not messages:
+            return response
+
+        triggers = []
+        for msg in messages:
+            toast_type = MESSAGE_LEVEL_MAP.get(msg.level, "info")
+            triggers.append(
+                {
+                    "message": msg.message,
+                    "type": toast_type,
+                }
+            )
+
+        if triggers:
+            # Use last message (most recent) as the primary toast
+            trigger = triggers[-1]
+            response["HX-Trigger"] = json.dumps(
+                {
+                    "show-toast": trigger,
+                }
+            )
+
+        return response