Add comments for code structure clarity; enhance readability across multiple components

src/hooks/SessionStore.js

@@ -1,3 +1,5 @@
+// --- Session Store ---
+
 const session = {
   currentUid: null,
   currentGid: null,
@@ -7,6 +9,8 @@ const session = {
   isAcceptedAdmin: false,
 };
 
+// --- Handlers ---
+
 const setSessionUser = (user) => {
   session.currentUid = user?.Uid ?? null;
   session.currentGid = user?.Gid ?? null;