fix: pipeline progress, message variables, jury invite flow, accept-invite UX

- Pipeline: SUBMISSION rounds count IN_PROGRESS + COMPLETED for progress %
- Round engine: remove phantom SubmissionFileRequirement check blocking auto-transition
- Messages: implement {{userName}}, {{projectName}}, {{roundName}}, {{programName}}, {{deadline}} substitution
- Email preview: show greeting, CTA button, and footer matching actual sent email
- Message composer: add green dot indicator for active rounds in round selector
- User create: generate invite token atomically (prevents stuck INVITED state on email failure)
- Jury invites: use jury-specific email template mentioning round context
- Bulk invite: animated progress bar, batch size hint, success/failure counts
- Accept invite: distinguish server errors (retry button) from expired tokens (redirect)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app/(admin)/admin/members/invite/page.tsx

@@ -1,6 +1,6 @@
 'use client'
 
-import { useState, useCallback, useMemo } from 'react'
+import { useState, useCallback, useMemo, useEffect, useRef } from 'react'
 import Link from 'next/link'
 import { useRouter } from 'next/navigation'
 import Papa from 'papaparse'
@@ -270,6 +270,8 @@ export default function MemberInvitePage() {
     skipped: number
     assignmentsCreated?: number
     invitationSent?: boolean
+    emailsSent?: number
+    emailErrors?: string[]
   } | null>(null)
 
   // Pre-assignment state
@@ -511,10 +513,34 @@ export default function MemberInvitePage() {
     setParsedUsers(parsedUsers.filter((u) => u.isValid))
 
   // --- Send ---
+  // Simulated progress: ramps up gradually while waiting for the backend
+  const progressIntervalRef = useRef<ReturnType<typeof setInterval> | null>(null)
+
+  const stopProgressSimulation = useCallback(() => {
+    if (progressIntervalRef.current) {
+      clearInterval(progressIntervalRef.current)
+      progressIntervalRef.current = null
+    }
+  }, [])
+
+  // Cleanup on unmount
+  useEffect(() => stopProgressSimulation, [stopProgressSimulation])
+
   const handleSendInvites = async () => {
     if (summary.valid === 0) return
     setStep('sending')
     setSendProgress(0)
+
+    // Simulate progress: advance quickly at first, then slow down (never reaches 100)
+    progressIntervalRef.current = setInterval(() => {
+      setSendProgress((prev) => {
+        if (prev >= 90) return prev // Cap at 90 — real completion sets 100
+        // Slow down as we approach 90
+        const increment = Math.max(0.5, (90 - prev) * 0.04)
+        return Math.min(90, prev + increment)
+      })
+    }, 300)
+
     try {
       const result = await bulkCreate.mutateAsync({
         users: summary.validUsers.map((u) => ({
@@ -526,10 +552,12 @@ export default function MemberInvitePage() {
         })),
         sendInvitation,
       })
+      stopProgressSimulation()
       setSendProgress(100)
       setResult(result)
       setStep('complete')
     } catch {
+      stopProgressSimulation()
       setStep('preview')
     }
   }
@@ -999,9 +1027,16 @@ export default function MemberInvitePage() {
             <CardContent className="flex flex-col items-center justify-center py-12">
               <Loader2 className="h-12 w-12 animate-spin text-primary" />
               <p className="mt-4 font-medium">
-                {sendInvitation ? 'Creating members and sending invitations...' : 'Creating members...'}
+                {sendInvitation
+                  ? `Creating ${summary.valid} member${summary.valid !== 1 ? 's' : ''} and sending invitations...`
+                  : `Creating ${summary.valid} member${summary.valid !== 1 ? 's' : ''}...`}
               </p>
-              <Progress value={sendProgress} className="mt-4 w-48" />
+              <Progress value={sendProgress} className="mt-4 w-64" />
+              {sendInvitation && summary.valid > 3 && (
+                <p className="text-muted-foreground text-sm mt-3">
+                  This may take a moment for large batches
+                </p>
+              )}
             </CardContent>
           </Card>
         )
@@ -1019,6 +1054,16 @@ export default function MemberInvitePage() {
               <p className="text-muted-foreground text-center max-w-sm mt-2">
                 {result?.created} member{result?.created !== 1 ? 's' : ''}{' '}
                 {result?.invitationSent ? 'created and invited' : 'created'}.
+                {result?.invitationSent && result.emailsSent != null && (
+                  <span className="block mt-1">
+                    {result.emailsSent} invitation{result.emailsSent !== 1 ? 's' : ''} sent successfully.
+                    {result.emailErrors && result.emailErrors.length > 0 && (
+                      <span className="text-destructive">
+                        {' '}{result.emailErrors.length} failed to send.
+                      </span>
+                    )}
+                  </span>
+                )}
                 {result?.skipped
                   ? ` ${result.skipped} skipped (already exist).`
                   : ''}