feat: Implement price info card component and product categories with grid view

- Added `price-info-card.component` to display total amount, tax, and payable amount.
- Integrated price masking directive for formatted price display.
- Created `categories.component` to list product categories with loading skeletons.
- Implemented `grid-view.component` for displaying products in a grid layout.
- Enhanced `products.component` to manage category selection and product display.
- Introduced new models for product categories and stock responses.
- Updated `main.service.ts` to fetch product categories and stock data.
- Refactored `POSStore` to manage state for products, categories, and order items.
- Added utility functions for price formatting and number normalization.
- Included placeholder images for product and logo.

src/app/shared/components/detailsInfoCard/details-info-card.component.html

@@ -1,10 +1,10 @@
 <p-card class="w-full border border-primary-700">
-  <div class="flex gap-5 text-primary-400">
+  <div class="flex gap-3 text-primary-400">
     <div class="shrink-0 pt-1">
       <i [class]="'pi ' + icon + ' text-2xl'"></i>
     </div>
     <div class="grow flex flex-col gap-1">
-      <span class="text-sm">{{ label }}</span>
+      <span class="text-sm font-bold">{{ label }}</span>
       <span class="text-xl font-bold text-primary">{{ value }}</span>
     </div>
   </div>