Refactor wallet storage and subscription handling

- Updated WalletStore to manage localStorage and handle storage events more effectively.
- Introduced mockAccountsSubscribe in constants for better account subscription handling.
- Removed unnecessary storage subscription from InjectionConfig.
- Enhanced Wallet class to utilize new account and metadata management methods.

src/store.ts

@@ -20,9 +20,14 @@ const defaultStore: WalletStoreType = {
 }
 
 export class WalletStore {
-    constructor(
-        private readonly store: WalletStorage,
-    ) {
+    private readonly store: WalletStorage;
+    private readonly storeSubscribe: (cb: (ev: StorageEvent) => void) => void;
+
+    constructor() {
+        this.store = window.localStorage as WalletStorage;
+        this.storeSubscribe = (cb): void => {
+            window.addEventListener('storage', cb);
+        };
         this._setupListeners();
     }
 
@@ -38,12 +43,12 @@ export class WalletStore {
     };
 
     private get _store(): WalletStoreType {
-        return JSON.parse(this.store.getItem(VARAN_WALLET_LS_KEY) || '{}') as WalletStoreType;
+        return Object.assign(defaultStore, JSON.parse(this.store.getItem(VARAN_WALLET_LS_KEY) || '{}')) as WalletStoreType;
     }
 
     private _setupListeners(): void {
         let currentState = this._store;
-        this.store.subscribe(ev => {
+        this.storeSubscribe(ev => {
             ev.stopImmediatePropagation();
             if (ev.key !== VARAN_WALLET_LS_KEY) return;
 
@@ -103,7 +108,7 @@ export class WalletStore {
     }
 
     get<Key extends keyof WalletStoreType>(key: Key): WalletStoreType[Key] {
-        return this._store[key];
+        return this._store[key] || defaultStore[key];
     }
 
     set<Key extends keyof WalletStoreType>(key: Key, value: WalletStoreType[Key]): void {