Add student account self-service security features and discoverability fixes; v2.1.0

Adds forgot/reset password, signup email verification, sign-out-of-all-devices,
note-usage and certificate display in account settings, and password-changed
security emails. Fixes study sessions being lost on server restart by
persisting them to disk, and fixes sanitizeStudyUsers silently dropping the
new pending-token fields on load. Also surfaces the lesson discussion board
in the main site nav, trims the sign-in page for returning users, and renames
colossiansStudy.tsx/colossiansStudyData.ts to studyPages.tsx/legacyColossiansData.ts
now that the study system covers more than Colossians.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/App.tsx

@@ -4,7 +4,7 @@ import { Link, NavLink, Routes, Route, useLocation, useNavigate, useParams } fro
 import AdminPage from './AdminPage'
 import QASection from './components/QASection'
 import ContactForm from './components/ContactForm'
-import { ColossiansStudyIndexPage, ColossiansStudyNotesPage, ColossiansStudySectionPage, StudyLandingPage, StudySignupPage, StudyAccountPage, StudyCommunityPage, StudyQuizPage } from './colossiansStudy'
+import { ColossiansStudyIndexPage, ColossiansStudyNotesPage, ColossiansStudySectionPage, StudyLandingPage, StudySignupPage, StudyAccountPage, StudyCommunityPage, StudyQuizPage, StudyResetPasswordPage, StudyVerifyEmailPage } from './studyPages'
 import { SpotifyIcon } from './icons'
 import type { SiteContent, StudyProgram, Testimonial } from './content'
 import { DEFAULTS } from './content'
@@ -386,6 +386,7 @@ function SiteHeader({ content }: { content: SiteContent }) {
   const location = useLocation()
   const episodesActive = location.pathname.startsWith('/episodes') || location.pathname.startsWith('/finished') || location.pathname.startsWith('/nuggets')
   const studiesActive = location.pathname.startsWith('/study') || location.pathname === '/scripture'
+  const communityStudy = getHomepageFeaturedStudy(content)
 
   useEffect(() => {
     function handleOutsideClick(e: MouseEvent) {
@@ -444,6 +445,9 @@ function SiteHeader({ content }: { content: SiteContent }) {
             <div className="nav-dropdown-menu">
               <div className="nav-dropdown-menu-inner">
                 <NavLink to="/study" className={({ isActive }) => `nav-dropdown-item${isActive ? ' nav-dropdown-item--active' : ''}`} onClick={() => { setMenuOpen(false); setStudiesOpen(false) }}>All Studies</NavLink>
+                {communityStudy && (
+                  <NavLink to={`/study/${communityStudy.slug}/community`} className={({ isActive }) => `nav-dropdown-item${isActive ? ' nav-dropdown-item--active' : ''}`} onClick={() => { setMenuOpen(false); setStudiesOpen(false) }}>Discussion</NavLink>
+                )}
                 <NavLink to="/scripture" className={({ isActive }) => `nav-dropdown-item${isActive ? ' nav-dropdown-item--active' : ''}`} onClick={() => { setMenuOpen(false); setStudiesOpen(false) }}>Scripture Index</NavLink>
               </div>
             </div>
@@ -3209,6 +3213,8 @@ export default function App() {
       <Route path="/start-here" element={<StartHerePage content={content} />} />
         <Route path="/study" element={<StudyRouteFrame content={content} child={<StudyLandingPage content={content} />} />} />
           <Route path="/study/signup" element={<StudyRouteFrame content={content} child={<StudySignupPage />} />} />
+        <Route path="/study/reset-password" element={<StudyRouteFrame content={content} child={<StudyResetPasswordPage />} />} />
+        <Route path="/study/verify-email" element={<StudyRouteFrame content={content} child={<StudyVerifyEmailPage />} />} />
         <Route path="/study/account" element={<StudyRouteFrame content={content} child={<StudyAccountPage />} />} />
         <Route path="/study/:studySlug" element={<StudyRouteFrame content={content} child={<ColossiansStudyIndexPage content={content} />} />} />
         <Route path="/study/:studySlug/community" element={<StudyRouteFrame content={content} child={<StudyCommunityPage content={content} />} />} />