Add styled notification emails and round-attached notifications

- Add 15+ styled email templates matching existing invite email design
- Wire up notification triggers in all routers (assignment, round, project, mentor, application, onboarding)
- Add test email button for each notification type in admin settings
- Add round-attached notifications: admins can configure which notification to send when projects enter a round
- Fall back to status-based notifications when round has no configured notification

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/(admin)/admin/rounds/[id]/edit/page.tsx

@@ -32,8 +32,24 @@ import {
   type Criterion,
 } from '@/components/forms/evaluation-form-builder'
 import { RoundTypeSettings } from '@/components/forms/round-type-settings'
-import { ArrowLeft, Loader2, AlertCircle, AlertTriangle } from 'lucide-react'
+import { ArrowLeft, Loader2, AlertCircle, AlertTriangle, Bell } from 'lucide-react'
 import { DateTimePicker } from '@/components/ui/datetime-picker'
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from '@/components/ui/select'
+
+// Available notification types for teams entering a round
+const TEAM_NOTIFICATION_OPTIONS = [
+  { value: '', label: 'No automatic notification', description: 'Teams will not receive a notification when entering this round' },
+  { value: 'ADVANCED_SEMIFINAL', label: 'Advanced to Semi-Finals', description: 'Congratulates team for advancing to semi-finals' },
+  { value: 'ADVANCED_FINAL', label: 'Selected as Finalist', description: 'Congratulates team for being selected as finalist' },
+  { value: 'NOT_SELECTED', label: 'Not Selected', description: 'Informs team they were not selected to continue' },
+  { value: 'WINNER_ANNOUNCEMENT', label: 'Winner Announcement', description: 'Announces the team as a winner' },
+]
 
 interface PageProps {
   params: Promise<{ id: string }>
@@ -68,6 +84,7 @@ function EditRoundContent({ roundId }: { roundId: string }) {
   const [formInitialized, setFormInitialized] = useState(false)
   const [roundType, setRoundType] = useState<'FILTERING' | 'EVALUATION' | 'LIVE_EVENT'>('EVALUATION')
   const [roundSettings, setRoundSettings] = useState<Record<string, unknown>>({})
+  const [entryNotificationType, setEntryNotificationType] = useState<string>('')
 
   // Fetch round data - disable refetch on focus to prevent overwriting user's edits
   const { data: round, isLoading: loadingRound } = trpc.round.get.useQuery(
@@ -118,9 +135,10 @@ function EditRoundContent({ roundId }: { roundId: string }) {
         votingStartAt: round.votingStartAt ? new Date(round.votingStartAt) : null,
         votingEndAt: round.votingEndAt ? new Date(round.votingEndAt) : null,
       })
-      // Set round type and settings
+      // Set round type, settings, and notification type
       setRoundType((round.roundType as typeof roundType) || 'EVALUATION')
       setRoundSettings((round.settingsJson as Record<string, unknown>) || {})
+      setEntryNotificationType(round.entryNotificationType || '')
       setFormInitialized(true)
     }
   }, [round, form, formInitialized])
@@ -139,7 +157,7 @@ function EditRoundContent({ roundId }: { roundId: string }) {
   }, [evaluationForm, loadingForm, criteriaInitialized])
 
   const onSubmit = async (data: UpdateRoundForm) => {
-    // Update round with type and settings
+    // Update round with type, settings, and notification
     await updateRound.mutateAsync({
       id: roundId,
       name: data.name,
@@ -148,6 +166,7 @@ function EditRoundContent({ roundId }: { roundId: string }) {
       settingsJson: roundSettings,
       votingStartAt: data.votingStartAt ?? null,
       votingEndAt: data.votingEndAt ?? null,
+      entryNotificationType: entryNotificationType || null,
     })
 
     // Update evaluation form if criteria changed and no evaluations exist
@@ -334,6 +353,39 @@ function EditRoundContent({ roundId }: { roundId: string }) {
             </CardContent>
           </Card>
 
+          {/* Team Notification */}
+          <Card>
+            <CardHeader>
+              <CardTitle className="text-lg flex items-center gap-2">
+                <Bell className="h-5 w-5" />
+                Team Notification
+              </CardTitle>
+              <CardDescription>
+                Notification sent to project teams when they enter this round
+              </CardDescription>
+            </CardHeader>
+            <CardContent>
+              <Select
+                value={entryNotificationType || 'none'}
+                onValueChange={(val) => setEntryNotificationType(val === 'none' ? '' : val)}
+              >
+                <SelectTrigger>
+                  <SelectValue placeholder="No automatic notification" />
+                </SelectTrigger>
+                <SelectContent>
+                  {TEAM_NOTIFICATION_OPTIONS.map((option) => (
+                    <SelectItem key={option.value || 'none'} value={option.value || 'none'}>
+                      {option.label}
+                    </SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+              <p className="text-sm text-muted-foreground mt-2">
+                When projects advance to this round, the selected notification will be sent to the project team automatically.
+              </p>
+            </CardContent>
+          </Card>
+
           {/* Evaluation Criteria */}
           <Card>
             <CardHeader>