Add SPA dispatch events and auto-close modals on navigation

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

app/RSpade/Core/SPA/Spa.js

@@ -577,6 +577,10 @@ class Spa {
         // (Browser refresh scroll is handled separately by Rsx._restore_scroll_on_refresh)
         Rsx.reset_pending_scroll();
 
+        // Trigger spa_dispatch_start event - allows cleanup before navigation
+        // Use case: close modals, cancel pending operations, etc.
+        Rsx.trigger('spa_dispatch_start', { url });
+
         try {
             const opts = {
                 history: options.history || 'auto',
@@ -943,10 +947,13 @@ class Spa {
                 // 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
+                // After action is fully ready (on_load + on_ready complete)
-                // This handles cases where on_load fetches data that increases page height
                 component.ready().then(() => {
+                    // Retry scroll restoration - handles cases where on_load fetches data that increases page height
                     Rsx.try_restore_scroll();
+
+                    // Trigger spa_dispatch_ready event - action is fully loaded and rendered
+                    Rsx.trigger('spa_dispatch_ready', { url, action: component });
                 });
             } else {
                 // This is a layout

app/RSpade/man/modals.txt

@@ -692,6 +692,29 @@ Returns: void (does not wait for close)
 
 Note: Call Modal.close() to dismiss the modal programmatically.
 
+================================================================================
+SPA INTEGRATION
+================================================================================
+
+The Modal system automatically integrates with SPA navigation:
+
+    Auto-Close on Navigation
+        When SPA navigation begins (spa_dispatch_start event), any open modal
+        is automatically closed. This prevents stale modals from persisting
+        across page transitions.
+
+        This behavior is automatic - no configuration required.
+
+    Modal Flow and Navigation
+        If you need to navigate after a modal action, use Spa.dispatch():
+
+            const result = await Modal.form({...});
+            if (result) {
+                Spa.dispatch(Rsx.Route('Target_Action'));
+            }
+
+        The modal closes first, then navigation proceeds.
+
 ================================================================================
 MODAL STATE MANAGEMENT
 ================================================================================

app/RSpade/man/spa.txt

@@ -580,6 +580,60 @@ NAVIGATION
         generated by Rsx.Route(), so it never appears in the browser address
         bar or generated links.
 
+SPA EVENTS
+    The SPA system fires global events that can be used to hook into the
+    navigation lifecycle. Register handlers using Rsx.on():
+
+    spa_dispatch_start
+        Fired at the beginning of navigation, before the old action is destroyed.
+        Use for cleanup before page transition.
+
+        Rsx.on('spa_dispatch_start', (data) => {
+            console.log('Navigating to:', data.url);
+            // Close modals, cancel pending operations, etc.
+        });
+
+        Data payload:
+            url: Target URL being navigated to
+
+        Common uses:
+            - Close open modals (Modal system does this automatically)
+            - Cancel pending Ajax requests
+            - Save unsaved form state
+            - Stop video/audio playback
+
+    spa_dispatch_ready
+        Fired after the new action has fully loaded (on_ready complete).
+        Use for post-navigation setup that needs the action to be ready.
+
+        Rsx.on('spa_dispatch_ready', (data) => {
+            console.log('Action ready:', data.action.constructor.name);
+            // Perform post-navigation actions
+        });
+
+        Data payload:
+            url: Current URL
+            action: The action component instance (fully loaded)
+
+        Common uses:
+            - Analytics page view tracking
+            - Focus management after navigation
+            - Lazy-load additional resources
+
+    Example: Custom navigation tracking
+
+        class Analytics_Tracker {
+            static on_app_modules_init() {
+                Rsx.on('spa_dispatch_start', () => {
+                    Analytics.track_page_exit();
+                });
+
+                Rsx.on('spa_dispatch_ready', (data) => {
+                    Analytics.track_page_view(data.url);
+                });
+            }
+        }
+
 SESSION VALIDATION
     After each SPA navigation (except initial load and back/forward), the client
     validates its state against the server by calling Rsx.validate_session().