Add GTM scripts and update Streamlit config

Imported `streamlit.components.v1` for custom HTML components. Added Google Tag Manager scripts to the `main` function using `components.html`. Set `initial_sidebar_state` to `None` and removed related comments. Cleaned up CSS to hide the sidebar and adjust element visibility.

app.py

@@ -1,4 +1,5 @@
 import streamlit as st
+import streamlit.components.v1 as components
 
 from battlewords.ui import run_app, _init_session
 
@@ -13,11 +14,25 @@ def main(opened=False):
     st.set_page_config(
         page_title="Battlewords",
         layout="wide",
-        #initial_sidebar_state="expanded" if opened else "collapsed",
         initial_sidebar_state=None,
         page_icon="app/static/favicon.ico"
     )
 
+    components.html('''
+    <!-- Google Tag Manager -->
+    <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
+    new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
+    j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
+    'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
+    })(window,document,'script','dataLayer','GTM-MKBM5JQ6');</script>
+    ''', height=0, width=0)
+
+    components.html('''
+    <!-- Google Tag Manager (noscript) -->
+    <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-MKBM5JQ6"
+    height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
+    ''', height=0, width=0)
+
     st.markdown(
         """<style>
                 div[data-testid='stSidebar'] { display: none !important; }