phase-2: add shared platform interfaces and type contracts

src/app/shared/models/ui/button.model.ts

@@ -0,0 +1,13 @@
+export interface ButtonConfig {
+  id?: string;
+  label: string;
+  variant: 'primary' | 'secondary' | 'tertiary' | 'ghost' | 'danger';
+  size?: 'sm' | 'md' | 'lg';
+  icon?: string;
+  disabled?: boolean;
+  loading?: boolean;
+  action?: {
+    type: 'navigate' | 'submit' | 'emit' | 'custom';
+    target?: string;
+  };
+}

src/app/shared/models/ui/category-card.model.ts

@@ -0,0 +1,11 @@
+import { ButtonConfig } from './button.model';
+
+export interface CategoryCardConfig {
+  id: string;
+  title: string;
+  description?: string;
+  imageUrl?: string;
+  icon?: string;
+  itemsCount?: number;
+  action?: ButtonConfig;
+}

src/app/shared/models/ui/index.ts

@@ -0,0 +1,3 @@
+export * from './button.model';
+export * from './category-card.model';
+export * from './product-card.model';

src/app/shared/models/ui/product-card.model.ts

@@ -0,0 +1,23 @@
+import { ButtonConfig } from './button.model';
+
+export interface ProductCardPrice {
+  amount: number;
+  currency: string;
+  originalAmount?: number;
+}
+
+export interface ProductCardConfig {
+  id: string;
+  sku: string;
+  title: string;
+  subtitle?: string;
+  imageUrl: string;
+  badges?: string[];
+  tags?: string[];
+  rating?: number;
+  reviewsCount?: number;
+  price: ProductCardPrice;
+  stockStatus?: 'in_stock' | 'low_stock' | 'out_of_stock';
+  primaryAction?: ButtonConfig;
+  secondaryAction?: ButtonConfig;
+}