feat: router.back() navigation, read-only evaluation view, auth audit logging

- Convert all Back buttons platform-wide (38 files) to use router.back()
  for natural browser-back behavior regardless of entry point
- Add read-only view for submitted evaluations in closed rounds with
  blue banner, disabled inputs, and contextual back navigation
- Add auth audit logs: MAGIC_LINK_SENT, PASSWORD_RESET_LINK_CLICKED,
  PASSWORD_RESET_LINK_EXPIRED, PASSWORD_RESET_LINK_INVALID
- Learning Hub links navigate in same window for all roles
- Update settings descriptions to reflect all-user scope

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/(applicant)/applicant/competition/page.tsx

@@ -1,16 +1,16 @@
 'use client'
 
 import { useSession } from 'next-auth/react'
-import Link from 'next/link'
-import type { Route } from 'next'
+import { useRouter } from 'next/navigation'
 import { trpc } from '@/lib/trpc/client'
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
 import { Button } from '@/components/ui/button'
 import { Skeleton } from '@/components/ui/skeleton'
 import { ApplicantCompetitionTimeline } from '@/components/applicant/competition-timeline'
-import { ArrowLeft, FileText, Calendar } from 'lucide-react'
+import { ArrowLeft, FileText } from 'lucide-react'
 
 export default function ApplicantCompetitionPage() {
+  const router = useRouter()
   const { data: session } = useSession()
   const { data: myProject, isLoading } = trpc.applicant.getMyDashboard.useQuery(undefined, {
     enabled: !!session,
@@ -36,11 +36,9 @@ export default function ApplicantCompetitionPage() {
             Track your progress through competition rounds
           </p>
         </div>
-        <Button variant="ghost" size="sm" asChild>
-          <Link href={'/applicant' as Route} aria-label="Back to applicant dashboard">
-            <ArrowLeft className="mr-2 h-4 w-4" />
-            Back to Dashboard
-          </Link>
+        <Button variant="ghost" size="sm" onClick={() => router.back()}>
+          <ArrowLeft className="mr-2 h-4 w-4" />
+          Back
         </Button>
       </div>
 
@@ -61,29 +59,6 @@ export default function ApplicantCompetitionPage() {
             <ApplicantCompetitionTimeline />
           </div>
           <div className="space-y-4">
-            <Card>
-              <CardHeader>
-                <CardTitle className="flex items-center gap-2">
-                  <Calendar className="h-5 w-5" />
-                  Quick Actions
-                </CardTitle>
-              </CardHeader>
-              <CardContent className="space-y-3">
-                <Button variant="outline" className="w-full justify-start" asChild>
-                  <Link href={'/applicant/documents' as Route}>
-                    <FileText className="mr-2 h-4 w-4" />
-                    View Documents
-                  </Link>
-                </Button>
-                {myProject?.openRounds && myProject.openRounds.length > 0 && (
-                  <p className="text-sm text-muted-foreground px-3 py-2 bg-muted/50 rounded-md">
-                    {myProject.openRounds.length} submission window
-                    {myProject.openRounds.length !== 1 ? 's' : ''} currently open
-                  </p>
-                )}
-              </CardContent>
-            </Card>
-
             <Card>
               <CardHeader>
                 <CardTitle>Timeline Info</CardTitle>

src/app/(applicant)/applicant/resources/[id]/page.tsx

@@ -1,8 +1,7 @@
 'use client'
 
 import { useEffect } from 'react'
-import { useParams } from 'next/navigation'
-import Link from 'next/link'
+import { useParams, useRouter } from 'next/navigation'
 import dynamic from 'next/dynamic'
 import { trpc } from '@/lib/trpc/client'
 import { Button } from '@/components/ui/button'
@@ -27,6 +26,7 @@ const ResourceRenderer = dynamic(
 
 export default function ApplicantResourceDetailPage() {
   const params = useParams()
+  const router = useRouter()
   const resourceId = params.id as string
 
   const { data: resource, isLoading, error } = trpc.learningResource.get.useQuery({ id: resourceId })
@@ -73,11 +73,9 @@ export default function ApplicantResourceDetailPage() {
             This resource may have been removed or you don't have access.
           </AlertDescription>
         </Alert>
-        <Button asChild>
-          <Link href="/applicant/resources">
-            <ArrowLeft className="mr-2 h-4 w-4" />
-            Back to Resources
-          </Link>
+        <Button onClick={() => router.back()}>
+          <ArrowLeft className="mr-2 h-4 w-4" />
+          Back
         </Button>
       </div>
     )
@@ -87,11 +85,9 @@ export default function ApplicantResourceDetailPage() {
     <div className="space-y-6">
       {/* Header */}
       <div className="flex items-center justify-between">
-        <Button variant="ghost" asChild className="-ml-4">
-          <Link href="/applicant/resources">
-            <ArrowLeft className="mr-2 h-4 w-4" />
-            Back to Resources
-          </Link>
+        <Button variant="ghost" onClick={() => router.back()} className="-ml-4">
+          <ArrowLeft className="mr-2 h-4 w-4" />
+          Back
         </Button>
         <div className="flex items-center gap-2">
           {resource.externalUrl && (