feat: live class sessions, CE workflow, and docs (#683)

Adds live-class session scheduling on lessons (join link, date/time,
timezone) with automatic 24h and 1h reminder emails plus a calendar
invite (.ics), a time-change notification with an updated invite, a
teacher-authored welcome email and session invite on enrollment, and a
"Notify students" quiz nudge.

LMS gets an upcoming live-sessions card and Join buttons, plus a
reusable live-session card component (3 states) in @cio/ui with a
Storybook story. The sidebar content tree now reflects sequential
progression locking like the content list, and the course-completion
confetti regression is fixed.

Org-based emails no longer reference ClassroomIO by name. Docs add
live-class, welcome-email, and course-progression guides, expand the
certificates guide (design, signatures, corrected labels), move
plan-required callouts to the top, flatten how-to-guides to the docs
root with redirects, and add screenshots. Includes an add-docs-image
skill.

apps/dashboard/src/lib/features/ui/navigation/breadcrumb.ts

@@ -81,15 +81,25 @@ export function generateBreadcrumbs(
     const normalizedPathname = pathname.replace(/\/$/, '');
 
     if (normalizedPathname !== parentBase) {
-      const activeSub = matchedNavItem.items.find((sub) => {
-        const subBase = sub.url.replace(/\/$/, '');
-        return normalizedPathname === subBase || normalizedPathname.startsWith(`${subBase}/`);
-      });
+      const activeSub = matchedNavItem.items.find((sub) => isActive(pathname, sub.url, sub.matchPattern, true));
       if (activeSub) {
         breadcrumbs.push({
           label: t(activeSub.title),
           href: activeSub.url
         });
+
+        const activeSubBase = activeSub.url.replace(/\/$/, '');
+        if (normalizedPathname !== activeSubBase && activeSub.nestedRoutes && pathSegments.length > 1) {
+          const activeNestedRoute = activeSub.nestedRoutes.find((route) => route.path === pathSegments[1]);
+
+          if (activeNestedRoute) {
+            breadcrumbs.push({
+              label: t(activeNestedRoute.titleKey),
+              href: `${currentOrgPath}${matchedNavItem.path}/${activeNestedRoute.path}`
+            });
+          }
+        }
+
         return breadcrumbs;
       }
     }

apps/dashboard/src/lib/features/ui/navigation/org-navigation.ts

@@ -201,11 +201,27 @@ export const baseNavConfig: NavItemConfig[] = [
     items: [
       {
         titleKey: 'settings.tabs.profile_tab',
-        path: '/settings'
+        path: '/settings',
+        matchPattern: '^/org/[^/]+/settings/?$'
       },
       {
         titleKey: 'settings.tabs.organization_tab',
-        path: '/settings/org'
+        path: '/settings/org',
+        matchPattern: '^/org/[^/]+/settings/(org|customize-lms|domains|teams)(/.*)?$',
+        nestedRoutes: [
+          {
+            path: 'domains',
+            titleKey: 'settings.organization.organization_profile.custom_domain.heading'
+          },
+          {
+            path: 'teams',
+            titleKey: 'settings.organization.organization_profile.team.heading'
+          },
+          {
+            path: 'customize-lms',
+            titleKey: 'settings.tabs.customize_lms_tab'
+          }
+        ]
       },
       {
         titleKey: 'settings.tabs.landing_page_tab',
@@ -331,7 +347,9 @@ export function getOrgNavigationItems(
           isActive: isActive(pagePathname, subUrl, subMatchPattern, true),
           url: subUrl,
           path: subConfig.path,
-          isPaid: subConfig.isPaid
+          matchPattern: subMatchPattern,
+          isPaid: subConfig.isPaid,
+          nestedRoutes: subConfig.nestedRoutes
         };
       });
     }
@@ -410,7 +428,9 @@ export function getOrgNavigationGroups(
           isActive: isActive(pathnameOnly, subUrl, subMatchPattern, true),
           url: subUrl,
           path: subConfig.path,
-          isPaid: subConfig.isPaid
+          matchPattern: subMatchPattern,
+          isPaid: subConfig.isPaid,
+          nestedRoutes: subConfig.nestedRoutes
         };
       });
     }