feat: add single column layout toggle option

src/services/local-storage.service.ts

@@ -51,6 +51,7 @@ class LocalStorageService {
   private shownCreateWalletGuideToastPubkeys: Set<string> = new Set()
   private sidebarCollapse: boolean = false
   private primaryColor: TPrimaryColor = 'DEFAULT'
+  private enableSingleColumnLayout: boolean = false
 
   constructor() {
     if (!LocalStorageService.instance) {
@@ -201,6 +202,9 @@ class LocalStorageService {
     this.primaryColor =
       (window.localStorage.getItem(StorageKey.PRIMARY_COLOR) as TPrimaryColor) ?? 'DEFAULT'
 
+    this.enableSingleColumnLayout =
+      window.localStorage.getItem(StorageKey.ENABLE_SINGLE_COLUMN_LAYOUT) === 'true'
+
     // Clean up deprecated data
     window.localStorage.removeItem(StorageKey.ACCOUNT_PROFILE_EVENT_MAP)
     window.localStorage.removeItem(StorageKey.ACCOUNT_FOLLOW_LIST_EVENT_MAP)
@@ -502,6 +506,15 @@ class LocalStorageService {
     this.primaryColor = color
     window.localStorage.setItem(StorageKey.PRIMARY_COLOR, color)
   }
+
+  getEnableSingleColumnLayout() {
+    return this.enableSingleColumnLayout
+  }
+
+  setEnableSingleColumnLayout(enable: boolean) {
+    this.enableSingleColumnLayout = enable
+    window.localStorage.setItem(StorageKey.ENABLE_SINGLE_COLUMN_LAYOUT, enable.toString())
+  }
 }
 
 const instance = new LocalStorageService()