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/server/routers/mentor.ts

@@ -6,6 +6,11 @@ import {
   getAIMentorSuggestions,
   getRoundRobinMentor,
 } from '../services/mentor-matching'
+import {
+  createNotification,
+  notifyProjectTeam,
+  NotificationTypes,
+} from '../services/in-app-notification'
 
 export const mentorRouter = router({
   /**
@@ -160,6 +165,42 @@ export const mentorRouter = router({
         },
       })
 
+      // Get team lead info for mentor notification
+      const teamLead = await ctx.prisma.teamMember.findFirst({
+        where: { projectId: input.projectId, role: 'LEAD' },
+        include: { user: { select: { name: true, email: true } } },
+      })
+
+      // Notify mentor of new mentee
+      await createNotification({
+        userId: input.mentorId,
+        type: NotificationTypes.MENTEE_ASSIGNED,
+        title: 'New Mentee Assigned',
+        message: `You have been assigned to mentor "${assignment.project.title}".`,
+        linkUrl: `/mentor/projects/${input.projectId}`,
+        linkLabel: 'View Project',
+        priority: 'high',
+        metadata: {
+          projectName: assignment.project.title,
+          teamLeadName: teamLead?.user?.name || 'Team Lead',
+          teamLeadEmail: teamLead?.user?.email,
+        },
+      })
+
+      // Notify project team of mentor assignment
+      await notifyProjectTeam(input.projectId, {
+        type: NotificationTypes.MENTOR_ASSIGNED,
+        title: 'Mentor Assigned',
+        message: `${assignment.mentor.name || 'A mentor'} has been assigned to support your project.`,
+        linkUrl: `/team/projects/${input.projectId}`,
+        linkLabel: 'View Project',
+        priority: 'high',
+        metadata: {
+          projectName: assignment.project.title,
+          mentorName: assignment.mentor.name,
+        },
+      })
+
       return assignment
     }),
 
@@ -269,6 +310,42 @@ export const mentorRouter = router({
         },
       })
 
+      // Get team lead info for mentor notification
+      const teamLead = await ctx.prisma.teamMember.findFirst({
+        where: { projectId: input.projectId, role: 'LEAD' },
+        include: { user: { select: { name: true, email: true } } },
+      })
+
+      // Notify mentor of new mentee
+      await createNotification({
+        userId: mentorId,
+        type: NotificationTypes.MENTEE_ASSIGNED,
+        title: 'New Mentee Assigned',
+        message: `You have been assigned to mentor "${assignment.project.title}".`,
+        linkUrl: `/mentor/projects/${input.projectId}`,
+        linkLabel: 'View Project',
+        priority: 'high',
+        metadata: {
+          projectName: assignment.project.title,
+          teamLeadName: teamLead?.user?.name || 'Team Lead',
+          teamLeadEmail: teamLead?.user?.email,
+        },
+      })
+
+      // Notify project team of mentor assignment
+      await notifyProjectTeam(input.projectId, {
+        type: NotificationTypes.MENTOR_ASSIGNED,
+        title: 'Mentor Assigned',
+        message: `${assignment.mentor.name || 'A mentor'} has been assigned to support your project.`,
+        linkUrl: `/team/projects/${input.projectId}`,
+        linkLabel: 'View Project',
+        priority: 'high',
+        metadata: {
+          projectName: assignment.project.title,
+          mentorName: assignment.mentor.name,
+        },
+      })
+
       return assignment
     }),
 
@@ -378,7 +455,7 @@ export const mentorRouter = router({
           }
 
           if (mentorId) {
-            await ctx.prisma.mentorAssignment.create({
+            const assignment = await ctx.prisma.mentorAssignment.create({
               data: {
                 projectId: project.id,
                 mentorId,
@@ -388,7 +465,48 @@ export const mentorRouter = router({
                 expertiseMatchScore,
                 aiReasoning,
               },
+              include: {
+                mentor: { select: { name: true } },
+                project: { select: { title: true } },
+              },
             })
+
+            // Get team lead info
+            const teamLead = await ctx.prisma.teamMember.findFirst({
+              where: { projectId: project.id, role: 'LEAD' },
+              include: { user: { select: { name: true, email: true } } },
+            })
+
+            // Notify mentor
+            await createNotification({
+              userId: mentorId,
+              type: NotificationTypes.MENTEE_ASSIGNED,
+              title: 'New Mentee Assigned',
+              message: `You have been assigned to mentor "${assignment.project.title}".`,
+              linkUrl: `/mentor/projects/${project.id}`,
+              linkLabel: 'View Project',
+              priority: 'high',
+              metadata: {
+                projectName: assignment.project.title,
+                teamLeadName: teamLead?.user?.name || 'Team Lead',
+                teamLeadEmail: teamLead?.user?.email,
+              },
+            })
+
+            // Notify project team
+            await notifyProjectTeam(project.id, {
+              type: NotificationTypes.MENTOR_ASSIGNED,
+              title: 'Mentor Assigned',
+              message: `${assignment.mentor.name || 'A mentor'} has been assigned to support your project.`,
+              linkUrl: `/team/projects/${project.id}`,
+              linkLabel: 'View Project',
+              priority: 'high',
+              metadata: {
+                projectName: assignment.project.title,
+                mentorName: assignment.mentor.name,
+              },
+            })
+
             assigned++
           } else {
             failed++