fix: product texts, mobile nav background, mobile product page layout

- Fix PayloadRichText: migrate custom JSX converters to Lexical v3 nodesToJSX API
  - paragraph, heading, list, listitem, quote, link converters now use nodesToJSX
  - Resolves missing product texts since PayloadCMS migration
- Fix mobile navigation: move overlay outside <header> to prevent fixed-position clipping
  - Header transform/backdrop-filter was containing the fixed overlay
  - Use bg-primary/95 backdrop-blur-3xl for premium blue background
- Fix product image mobile layout: use md:-mt-32 responsive prefix
  - Negative margin only applies on md+ to avoid overlap on mobile
- Improve mobile product page UX:
  - Breadcrumbs: flex-wrap, truncate, reduced separator spacing
  - Hero: reduced top padding pt-28 on mobile
  - Product image card: 4/3 aspect ratio and smaller padding on mobile
  - Section spacing: use responsive md: prefixes throughout
  - Data tables: 2-col grid on mobile, smaller card padding/radius
  - Tables: add right-edge scroll hint gradient on mobile

lib/products.ts

@@ -18,6 +18,7 @@ export interface ProductData {
   slug: string;
   frontmatter: ProductFrontmatter;
   content: any; // Lexical AST from Payload
+  application?: any; // Lexical AST for Application field
 }
 
 export async function getProductMetadata(
@@ -113,6 +114,7 @@ export async function getProductBySlug(slug: string, locale: string): Promise<Pr
               : 50,
         },
         content: doc.content,
+        application: doc.application,
       };
     }
 
@@ -195,6 +197,7 @@ export async function getAllProducts(locale: string): Promise<ProductData[]> {
               : 50,
         },
         content: null,
+        application: null,
       };
     });