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

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

app/RSpade/man/spa.txt

@@ -419,7 +419,7 @@ SUBLAYOUTS
 
     References:
         Spa.layout      Always the top-level layout
-        Spa.action      Always the bottom-level action (not a layout)
+        Spa.action()    Always the bottom-level action (not a layout)
 
         To access intermediate layouts, use DOM traversal or layout hooks.
 
@@ -516,11 +516,11 @@ NAVIGATION
 
     Accessing Active Components:
         Spa.layout      Reference to current layout component instance
-        Spa.action      Reference to current action component instance
+        Spa.action()    Reference to current action component instance
 
         Example:
             // From anywhere in SPA context
-            Spa.action.reload();           // Reload current action
+            Spa.action().reload();         // Reload current action
             Spa.layout.update_nav();       // Call layout method
 
     Loader Title Hint:
@@ -821,7 +821,7 @@ COMMON PATTERNS
 
     Reloading Current Action:
         // Refresh current action data
-        Spa.action.reload();
+        Spa.action().reload();
 
     Form Submission with Redirect:
         async on_submit() {
@@ -880,7 +880,7 @@ DETACHED ACTION LOADING
         });
 
     What It Does NOT Affect:
-    - Spa.action (current live action remains unchanged)
+    - Spa.action() (current live action remains unchanged)
     - Spa.layout (current live layout remains unchanged)
     - Spa.route / Spa.params (current route state unchanged)
     - Browser history