Convert Spa.action property to Spa.action() method

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

app/RSpade/Core/SPA/Spa.js

@@ -19,8 +19,8 @@ class Spa {
     // Current layout instance
     static layout = null;
 
-    // Current action instance
-    static action = null;
+    // Current action instance (use Spa.action() to access)
+    static _action = null;
 
     // Current route instance
     static route = null;
@@ -49,6 +49,29 @@ class Spa {
     // Grace period in milliseconds for suppressing errors after navigation
     static NAVIGATION_GRACE_PERIOD_MS = 10000;
 
+    /**
+     * Get the current action component instance
+     *
+     * Returns the cached action if available, otherwise finds it from the DOM.
+     * This method should be used instead of direct property access to ensure
+     * the action is always found even if the cache was cleared.
+     *
+     * @returns {Spa_Action|null} The current action instance, or null if none
+     */
+    static action() {
+        if (Spa._action) {
+            return Spa._action;
+        }
+
+        const $spa_action = $('.Spa_Action').first();
+        if (!$spa_action.exists()) {
+            return null;
+        }
+
+        Spa._action = $spa_action.component();
+        return Spa._action;
+    }
+
     /**
      * Check if we're within the navigation grace period
      *
@@ -543,6 +566,9 @@ class Spa {
 
         Spa.is_dispatching = true;
 
+        // Clear cached action - will be set when new action is created
+        Spa._action = null;
+
         // Record navigation timestamp for error suppression grace period
         // Errors from previous page's pending requests should be ignored for 10 seconds
         Spa._navigation_timestamp = Date.now();
@@ -911,7 +937,7 @@ class Spa {
 
             if (is_last) {
                 // This is the action - set reference but don't wait
-                Spa.action = component;
+                Spa._action = component;
             } else {
                 // This is a layout
                 // Wait for render to complete (not full ready - we don't need child data to load)
@@ -932,7 +958,7 @@ class Spa {
 
         for (const layout of layouts_for_on_action) {
             // Set action reference before calling on_action so layouts can access it
-            layout.action = Spa.action;
+            layout.action = Spa.action();
             if (layout.on_action) {
                 layout.on_action(url, action_name, args);
             }