Add scroll restoration on browser refresh for SPA pages

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

app/RSpade/Core/SPA/Spa.js

@@ -573,6 +573,10 @@ class Spa {
         // Errors from previous page's pending requests should be ignored for 10 seconds
         Spa._navigation_timestamp = Date.now();
 
+        // Reset any pending scroll restoration from previous navigation
+        // (Browser refresh scroll is handled separately by Rsx._restore_scroll_on_refresh)
+        Rsx.reset_pending_scroll();
+
         try {
             const opts = {
                 history: options.history || 'auto',
@@ -938,6 +942,12 @@ class Spa {
             if (is_last) {
                 // This is the action - set reference but don't wait
                 Spa._action = component;
+
+                // After action is fully ready (on_load + on_ready complete), retry scroll restoration
+                // This handles cases where on_load fetches data that increases page height
+                component.ready().then(() => {
+                    Rsx.try_restore_scroll();
+                });
             } else {
                 // This is a layout
                 // Wait for render to complete (not full ready - we don't need child data to load)