fix(mentor): defer in-app-notification emails when mentoring round is draft

Mentor-assignment flows (mentor.assign, autoAssign, bulkAssign,
bulkAutoAssign, autoAssignBulkForRound) call createNotification and
notifyProjectTeam for MENTEE_ASSIGNED / MENTOR_ASSIGNED. Both
notification types have NotificationEmailSetting.sendEmail = true, so
the notification system fires its own styled email in addition to the
explicit mentor-team / coalesced emails on the same code path. The
earlier defer-emails-until-round-open fix only gated the explicit
sendMentorBulkAssignmentEmail / sendMentorTeamAssignmentEmail calls;
this parallel email path kept firing immediately at every assignment.

Result on prod 2026-05-26: Camille Lopez (assigned to 9 projects via
two bulk_assigns) received 7 emails at 15:04 + 1 at 15:32 from the
notification-system path during draft, plus 1 coalesced email at the
18:20 round activation = 9 sends instead of 1. Every PEARL team
member (and equivalents on other teams) received 3 emails for the
same reason.

Fix
- Add `skipEmail?: boolean` to CreateNotificationParams,
  createNotification, createBulkNotifications, and (via spread)
  notifyProjectTeam. When true the in-app notification row still
  fires but the parallel email send is suppressed; the coalesced
  mentor email and team intro at activateRound time remain the
  single source of email truth.
- Wire it up in every mentor-assignment site: compute the existing
  shouldDeferEmailsForProject gate once before the createNotification
  / notifyProjectTeam calls and pass `skipEmail: deferThisEmail`.
  bulkAssign precomputes draftProjectIds for the whole batch.
  autoAssignBulkForRound uses the round's status directly.
- New regression suite (mentor-email-deferral.test.ts, 3 cases):
  vi.mocks @/lib/email, asserts zero outbound sends when round is
  ROUND_DRAFT, confirms in-app notification rows still get written,
  and re-verifies the ACTIVE-round path still emails.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/server/routers/mentor.ts

@@ -465,6 +465,15 @@ export const mentorRouter = router({
         include: { user: { select: { name: true, email: true } } },
       })
 
+      // Defer emails (mentor-side and team-side) while the project's MENTORING
+      // round is still ROUND_DRAFT — `activateRound` coalesces and fires them
+      // when the admin opens the round. In-app notifications still fire so the
+      // staged assignment is visible immediately.
+      const deferThisEmail = await shouldDeferEmailsForProject(
+        ctx.prisma,
+        input.projectId,
+      )
+
       // Notify mentor of new mentee
       await createNotification({
         userId: input.mentorId,
@@ -479,6 +488,7 @@ export const mentorRouter = router({
           teamLeadName: teamLead?.user?.name || 'Team Lead',
           teamLeadEmail: teamLead?.user?.email,
         },
+        skipEmail: deferThisEmail,
       })
 
       // Notify project team of mentor assignment
@@ -493,15 +503,9 @@ export const mentorRouter = router({
           projectName: assignment.project.title,
           mentorName: assignment.mentor.name,
         },
+        skipEmail: deferThisEmail,
       })
 
-      // Defer the mentor-side email if the project's MENTORING round is still
-      // ROUND_DRAFT — `activateRound` will coalesce and send when the admin
-      // opens the round. Otherwise fire the per-assignment email immediately.
-      const deferThisEmail = await shouldDeferEmailsForProject(
-        ctx.prisma,
-        input.projectId,
-      )
       if (
         !deferThisEmail &&
         assignment.notificationSentAt == null &&
@@ -661,6 +665,13 @@ export const mentorRouter = router({
         include: { user: { select: { name: true, email: true } } },
       })
 
+      // Defer email notifications if the project's MENTORING round is still
+      // in draft — activateRound will fire coalesced emails at round-open.
+      const deferThisEmail = await shouldDeferEmailsForProject(
+        ctx.prisma,
+        input.projectId,
+      )
+
       // Notify mentor of new mentee
       await createNotification({
         userId: mentorId,
@@ -675,6 +686,7 @@ export const mentorRouter = router({
           teamLeadName: teamLead?.user?.name || 'Team Lead',
           teamLeadEmail: teamLead?.user?.email,
         },
+        skipEmail: deferThisEmail,
       })
 
       // Notify project team of mentor assignment
@@ -689,6 +701,7 @@ export const mentorRouter = router({
           projectName: assignment.project.title,
           mentorName: assignment.mentor.name,
         },
+        skipEmail: deferThisEmail,
       })
 
       return assignment
@@ -777,8 +790,22 @@ export const mentorRouter = router({
       let totalAssigned = 0
       let totalSkipped = 0
 
+      // Pre-compute which projects must defer outbound email because their
+      // MENTORING round is still in draft. The in-app notification still
+      // fires; only the parallel notification-system email is suppressed,
+      // exactly like the coalesced mentor email path below. `activateRound`
+      // sends one combined email per mentor + one team intro per project
+      // when the admin opens the round.
+      const draftProjectIds = new Set<string>()
+      for (const project of projects) {
+        if (await shouldDeferEmailsForProject(ctx.prisma, project.id)) {
+          draftProjectIds.add(project.id)
+        }
+      }
+
       for (const project of projects) {
         const alreadyOn = new Set(project.mentorAssignments.map((a) => a.mentorId))
+        const deferForThis = draftProjectIds.has(project.id)
         for (const mentor of validMentors) {
           const bucket = perMentor.get(mentor.id)!
           if (alreadyOn.has(mentor.id)) {
@@ -808,6 +835,7 @@ export const mentorRouter = router({
             linkLabel: 'View Project',
             priority: 'high',
             metadata: { projectName: project.title },
+            skipEmail: deferForThis,
           })
 
           await notifyProjectTeam(project.id, {
@@ -818,6 +846,7 @@ export const mentorRouter = router({
             linkLabel: 'View Project',
             priority: 'high',
             metadata: { projectName: project.title, mentorName: mentor.name },
+            skipEmail: deferForThis,
           })
         }
 
@@ -852,16 +881,7 @@ export const mentorRouter = router({
         }
       }
 
-      // Decide per-project whether to defer email until round-open: projects
-      // whose MENTORING round is still ROUND_DRAFT skip email and stamp now;
-      // `activateRound` will coalesce and send when the admin opens the round.
-      const draftProjectIds = new Set<string>()
-      for (const projectId of touchedProjectIds) {
-        if (await shouldDeferEmailsForProject(ctx.prisma, projectId)) {
-          draftProjectIds.add(projectId)
-        }
-      }
-
+      // `draftProjectIds` was computed before the assignment loop above.
       // One email per mentor, listing only their NEW projects whose mentoring
       // round is NOT in draft. If every new project is deferred, no email.
       for (const bucket of perMentor.values()) {
@@ -1083,6 +1103,12 @@ export const mentorRouter = router({
               include: { user: { select: { name: true, email: true } } },
             })
 
+            // Defer emails when the project's MENTORING round is still in draft.
+            const deferThisEmail = await shouldDeferEmailsForProject(
+              ctx.prisma,
+              project.id,
+            )
+
             // Notify mentor
             await createNotification({
               userId: mentorId,
@@ -1097,6 +1123,7 @@ export const mentorRouter = router({
                 teamLeadName: teamLead?.user?.name || 'Team Lead',
                 teamLeadEmail: teamLead?.user?.email,
               },
+              skipEmail: deferThisEmail,
             })
 
             // Notify project team
@@ -1111,6 +1138,7 @@ export const mentorRouter = router({
                 projectName: assignment.project.title,
                 mentorName: assignment.mentor.name,
               },
+              skipEmail: deferThisEmail,
             })
 
             assigned++
@@ -1164,7 +1192,7 @@ export const mentorRouter = router({
     .mutation(async ({ ctx, input }) => {
       const round = await ctx.prisma.round.findUniqueOrThrow({
         where: { id: input.roundId },
-        select: { id: true, roundType: true, configJson: true },
+        select: { id: true, roundType: true, configJson: true, status: true },
       })
       if (round.roundType !== 'MENTORING') {
         throw new TRPCError({
@@ -1211,6 +1239,11 @@ export const mentorRouter = router({
       let assigned = 0
       let unassignable = 0
 
+      // Defer outbound emails when the round is still in draft — same gate
+      // used by mentor.assign/bulkAssign. In-app notifications still fire so
+      // the staged assignment is visible to the mentor + team immediately.
+      const deferEmailsForRound = round.status === 'ROUND_DRAFT'
+
       // Coalesce per-mentor so we send ONE email per mentor at the end of the
       // batch, even when the algorithm assigns the same mentor to several teams.
       const perMentor = new Map<
@@ -1287,6 +1320,7 @@ export const mentorRouter = router({
               teamLeadName: teamLead?.user?.name || 'Team Lead',
               teamLeadEmail: teamLead?.user?.email,
             },
+            skipEmail: deferEmailsForRound,
           })
 
           await notifyProjectTeam(project.id, {
@@ -1300,6 +1334,7 @@ export const mentorRouter = router({
               projectName: assignment.project.title,
               mentorName: assignment.mentor.name,
             },
+            skipEmail: deferEmailsForRound,
           })
 
           // Accumulate for the coalesced email