feat: edit-attendees dialog + roster card on applicant dashboard

Adds applicant.getMyFinalistConfirmation query (returns roster + cutoff
metadata for the team's confirmation, or null). New AttendingMembersCard
shows the confirmed attendee list and surfaces an Edit dialog to the
team lead — disabled past the editable cutoff. Card auto-hides until the
confirmation reaches CONFIRMED status.

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

src/server/routers/applicant.ts

@@ -2705,4 +2705,73 @@ export const applicantRouter = router({
         unreadCount,
       }
     }),
+
+  /**
+   * Returns the caller's project's finalist confirmation (if any) plus the
+   * data needed by the team-lead's "Edit attendees" dialog: the team roster,
+   * the current AttendingMember rows, the program cap, and the editable
+   * cutoff derived from the LIVE_FINAL round window.
+   *
+   * Returns null when the caller is not on a team with a confirmation.
+   */
+  getMyFinalistConfirmation: protectedProcedure.query(async ({ ctx }) => {
+    const project = await ctx.prisma.project.findFirst({
+      where: { teamMembers: { some: { userId: ctx.user.id } } },
+      include: {
+        program: { select: { id: true, defaultAttendeeCap: true } },
+        teamMembers: {
+          include: {
+            user: { select: { id: true, name: true, email: true } },
+          },
+          orderBy: { joinedAt: 'asc' },
+        },
+        finalistConfirmation: {
+          include: {
+            attendingMembers: { select: { userId: true, needsVisa: true } },
+          },
+        },
+      },
+      orderBy: { createdAt: 'desc' },
+    })
+
+    if (!project || !project.finalistConfirmation) return null
+
+    const callerMember = project.teamMembers.find((tm) => tm.userId === ctx.user.id)
+    const isLead = callerMember?.role === 'LEAD'
+
+    let cutoffAt: Date | null = null
+    let editableNow = true
+    const round = await ctx.prisma.round.findFirst({
+      where: { competition: { programId: project.program.id }, roundType: 'LIVE_FINAL' },
+      orderBy: { sortOrder: 'desc' },
+      select: { windowOpenAt: true, configJson: true },
+    })
+    if (round?.windowOpenAt) {
+      const cfg = (round.configJson ?? {}) as { attendeeEditCutoffHours?: number }
+      const cutoffHours = cfg.attendeeEditCutoffHours ?? 48
+      cutoffAt = new Date(round.windowOpenAt.getTime() - cutoffHours * 3_600_000)
+      editableNow = Date.now() <= cutoffAt.getTime()
+    }
+
+    return {
+      project: {
+        id: project.id,
+        title: project.title,
+        teamMembers: project.teamMembers.map((tm) => ({
+          userId: tm.userId,
+          role: tm.role,
+          user: tm.user,
+        })),
+        program: { defaultAttendeeCap: project.program.defaultAttendeeCap },
+      },
+      confirmation: {
+        id: project.finalistConfirmation.id,
+        status: project.finalistConfirmation.status,
+        attendingMembers: project.finalistConfirmation.attendingMembers,
+      },
+      isLead,
+      cutoffAt,
+      editableNow,
+    }
+  }),
 })