fix(webui): finish ?=…→/… URL migration in two missed nav spots

Both used the pre-migration query/.html URL form through navigation that
no longer exists, so they landed on a not-found / wrong page:

- setup-wizard handoffToTasks: navigated to `tasks.html?task=<id>` via the
  never-defined window.router, falling back to a *relative*
  window.location.href. From any non-root path that resolves under the
  current path (e.g. /admin/config/tasks.html → matches the /admin*
  route), so the first-install "x of x installing" hand-off hit a
  not-found task page. Now navigates to the path-based
  `/tasks/all?task=<id>&from=setup` via window.navigateToRoute (absolute
  full-load fallback).
- apps-manager getNavigationButton / handleNavigation: the "Install
  <Service>" buttons on config requirement fields used
  `app.html?app=<name>` with a relative window.location.href; from the
  /admin/config/* pages they render on, that resolved to
  /admin/config/app.html (wrong route). Now `/app/<name>` via
  navigateToRoute.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>

containers/libreportal/frontend/js/components/app/apps-manager.js

@@ -1914,10 +1914,10 @@ class AppsManager {
   // Get navigation button for installing required services
   getNavigationButton(fieldKey) {
     const servicePages = {
-      'AUTHELIA': 'app.html?app=authelia',
+      'AUTHELIA': '/app/authelia',
-      'HEADSCALE': 'app.html?app=headscale', 
+      'HEADSCALE': '/app/headscale',
-      'WHITELIST': 'app.html?app=traefik',
+      'WHITELIST': '/app/traefik',
-      'TRAEFIK': 'app.html?app=traefik'
+      'TRAEFIK': '/app/traefik'
     };
     
     let serviceName;
@@ -1947,8 +1947,14 @@ class AppsManager {
 
   // Handle navigation with unsaved changes check
   handleNavigation(url, serviceName) {
-    // For now, just navigate - could add unsaved changes detection later
+    // SPA in-app nav (path-based routes), with an absolute-path full-load
-    window.location.href = url;
+    // fallback. A relative window.location.href here resolved wrong from the
+    // /admin/config/* pages these buttons render on.
+    if (typeof window.navigateToRoute === 'function' && window.spaClean) {
+      window.navigateToRoute(url);
+    } else {
+      window.location.href = url;
+    }
   }
 
   // Generate disabled field with navigation button

containers/libreportal/frontend/js/system/setup-wizard.js

@@ -668,9 +668,12 @@ class SetupWizard {
 
     this.container.classList.add('setup-launched');
     setTimeout(() => {
-      const target = `tasks.html?task=${encodeURIComponent(firstTaskId)}&from=setup`;
+      // Path-based route (the app uses /… URLs); the specific task is still
-      if (window.router && typeof window.router.navigate === 'function') {
+      // selected via ?task=. Navigate via the SPA helper, with an absolute-path
-        window.router.navigate(target);
+      // full-load fallback.
+      const target = `/tasks/all?task=${encodeURIComponent(firstTaskId)}&from=setup`;
+      if (typeof window.navigateToRoute === 'function' && window.spaClean) {
+        window.navigateToRoute(target);
         this.hide();
       } else {
         window.location.href = target;