web: start: responsive work

Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>

web/index.html

@@ -59,6 +59,11 @@
       gap: 20px;
     }
 
+    /* Mobile: side-nav gère sa propre géométrie via inline styles (JS) */
+    @media (max-width: 768px) {
+      main { padding: 16px; }
+    }
+
     #error {
       display: none;
       background: #313244;