Add PWA service worker (via vite plugin), use dynamic viewport units for interface size (improves mobile experience), replace default vue homepage with basic info

backend/src/chat.py

@@ -41,13 +41,16 @@ class Thread:
         self.memories = []
 
 class ChatView:
-    def __init__(self, app, chat_id):
+    def __init__(self, app, chat_id, participant_type=None, participant_id=None):
         self.app = app
         self.chat_id = chat_id
 
         self.name = None
         self.description = None
 
+        self.participant_type = participant_type
+        self.participant_id = participant_id
+
         # Thread holding messages without a set thread id
         self.default_thread = Thread(None, chat_id)
         # Most recent thread objects, earliest to latest