feat(web-app-littlejs): add JS submenu support, left-expand menus, improve headline & cleanup examples

This update introduces full JavaScript-based nested submenu handling for the
Apps menu, enabling reliable click-based toggling without interference from
Bootstrap’s native dropdown logic. Submenus now expand to the left via custom
CSS and no longer require dropstart or data-bs-toggle attributes.

Changes include:
- Add javascript feature flag and enable inline eval in CSP
- Add javascript.js implementing custom submenu toggle logic
- Add CSS rules for left-expanding nested dropdown menus
- Replace hardcoded headline with LITTLEJS_HEADLINE variable
- Modernize “Play” → “Start” labels in cards
- Remove unused/legacy examples from examples.yml (commented out, not deleted)
- Cleanup nav_top.html.j2 to remove conflicting Bootstrap attributes

Conversation reference:
https://chatgpt.com/share/6928b4c7-19ec-800f-a087-9af304ef4ed9

roles/web-app-littlejs/files/javascript.js

@@ -0,0 +1,35 @@
+document.addEventListener('DOMContentLoaded', function () {
+  // Toggle second-level menus on click
+  const submenuTriggers = document.querySelectorAll('.dropdown-submenu > a.dropdown-toggle');
+
+  submenuTriggers.forEach(function (trigger) {
+    trigger.addEventListener('click', function (e) {
+      e.preventDefault();
+      e.stopPropagation();
+
+      const submenu = this.nextElementSibling;
+      if (!submenu) return;
+
+      // Close other open submenus on the same level
+      const parentMenu = this.closest('.dropdown-menu');
+      if (parentMenu) {
+        parentMenu.querySelectorAll('.dropdown-menu.show').forEach(function (menu) {
+          if (menu !== submenu) {
+            menu.classList.remove('show');
+          }
+        });
+      }
+
+      submenu.classList.toggle('show');
+    });
+  });
+
+  // When the main Apps dropdown closes, close all submenus
+  document.querySelectorAll('.navbar .dropdown').forEach(function (dropdown) {
+    dropdown.addEventListener('hide.bs.dropdown', function () {
+      this.querySelectorAll('.dropdown-menu.show').forEach(function (menu) {
+        menu.classList.remove('show');
+      });
+    });
+  });
+});