feat(cardex): implement cardex module with filters, templates, and service integration

src/app/core/state/base-store.ts

@@ -13,6 +13,7 @@ export interface BaseState<T = any> {
   items?: T;
   meta?: Maybe<IPaginatedQuery>;
   isRefreshing?: boolean;
+  initialized: boolean;
 }
 
 /**
@@ -77,6 +78,7 @@ export abstract class BaseStore<T extends BaseState> {
   readonly state: Signal<T>;
   readonly loading: Signal<boolean>;
   readonly error: Signal<Maybe<string>>;
+  readonly initialized: Signal<boolean>;
 
   // Observable for RxJS compatibility
   readonly state$: Observable<T>;
@@ -89,6 +91,7 @@ export abstract class BaseStore<T extends BaseState> {
     this.state = this._state.asReadonly();
     this.loading = computed(() => this._state().loading);
     this.error = computed(() => this._state().error);
+    this.initialized = computed(() => this._state().initialized);
 
     // Observable for RxJS compatibility
     this.state$ = this._stateSubject.asObservable();

src/app/core/state/global/global.store.ts

@@ -85,6 +85,7 @@ export class GlobalStore extends BaseStore<GlobalState> {
 
   constructor() {
     super({
+      initialized: false,
       loading: false,
       error: null,
       sidebarCollapsed: false,
@@ -300,6 +301,7 @@ export class GlobalStore extends BaseStore<GlobalState> {
    */
   reset(): void {
     this.setState({
+      initialized: false,
       loading: false,
       error: null,
       sidebarCollapsed: false,