feat: Prevent saving preferences and status when impersonating (#11164)

This PR will prevent saving user preferences and online status when impersonating. Previously, these settings could be updated during impersonation, causing the user to see a different view or UI settings.

Fixes https://linear.app/chatwoot/issue/CW-4163/impersonation-improvements

app/javascript/shared/helpers/sessionStorage.js

@@ -0,0 +1,26 @@
+export default {
+  clearAll() {
+    window.sessionStorage.clear();
+  },
+
+  get(key) {
+    try {
+      const value = window.sessionStorage.getItem(key);
+      return value ? JSON.parse(value) : null;
+    } catch (error) {
+      return window.sessionStorage.getItem(key);
+    }
+  },
+
+  set(key, value) {
+    if (typeof value === 'object') {
+      window.sessionStorage.setItem(key, JSON.stringify(value));
+    } else {
+      window.sessionStorage.setItem(key, value);
+    }
+  },
+
+  remove(key) {
+    window.sessionStorage.removeItem(key);
+  },
+};