website refactor

docs/architecture/website/VIEW_DATA.md

@@ -43,15 +43,22 @@ useEffect(() => {
   setViewModel(vm);
 }, []);
 
-// Template receives ViewModel, not ViewData
-return viewModel ? <Template viewModel={viewModel} /> : null;
+// Template receives ViewData from ViewModel
+return viewModel ? <Template viewData={viewModel.viewData} /> : null;
 ```
 
 Templates MUST NOT compute derived values.
 
 ViewData Builders MUST NOT call the API.
 
-## 4) Determinism rules
+## 4) Formatting and SEO
+
+ViewData is responsible for providing **fully formatted strings** to Templates for Server-Side Rendering (SSR).
+
+- **SEO Requirement:** All data required for search engines (prices, dates, counts, labels) MUST be formatted in the `ViewData Builder` on the server.
+- **Template Simplicity:** Templates should simply render the strings provided in `ViewData` without further processing.
+
+## 5) Determinism rules
 
 Any formatting used to produce ViewData MUST be deterministic.