Add route parameter handling for appeal paths and enhance AuthGuard to support login via code query parameter

frontend/src/app/app.routes.ts

@@ -118,18 +118,27 @@ export const routes: Routes = [
     path: 'forms',
     loadComponent: () => import('./pages/forms/forms.component').then(m => m.FormsComponent)
   },
+  {
+    path: 'appeal/:code',
+    redirectTo: 'forms/appeal/:code',
+    pathMatch: 'full'
+  },
   {
     path: 'appeal',
     redirectTo: 'forms/appeal',
     pathMatch: 'full'
   },
+  {
+    path: 'forms/appeal/:code',
+    loadComponent: () => import('./pages/forms/appeal/appeal.component').then(m => m.AppealComponent),
+    canActivate: [AuthGuard],
+    data: {requiredAuthorizations: ['SCOPE_user']}
+  },
   {
     path: 'forms/appeal',
     loadComponent: () => import('./pages/forms/appeal/appeal.component').then(m => m.AppealComponent),
     canActivate: [AuthGuard],
-    data: {
-      requiredAuthorizations: ['SCOPE_user']
-    }
+    data: {requiredAuthorizations: ['SCOPE_user']}
   },
   {
     path: 'forms/sent',