Use rendered() for SPA layout chain, add jqhtml lifecycle docs

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Co-Authored-By: Claude <noreply@anthropic.com>

app/RSpade/Core/SPA/Spa.js

@@ -848,8 +848,9 @@ class Spa {
             // Create component
             const component = $current_container.component(component_name, is_last ? args : {}).component();
 
-            // Wait for it to be ready
-            await component.ready();
+            // Wait for render to complete (not full ready - we don't need child data to load)
+            // This allows layout navigation to update immediately while action loads
+            await component.rendered();
 
             if (is_last) {
                 // This is the action