feat: add email preview to award notification and finalization tab

- Award "Notify Pool" dialog now uses EmailPreviewDialog with live preview
- Button shows eligible project count: "Notify Pool (38)"
- Finalization tab email section has "Preview" buttons for both
  advancement and rejection messages
- EmailPreviewDialog supports previewOnly mode (close button, no send)
- Backend: previewAwardSelectionEmail, previewFinalizationAdvancementEmail,
  previewFinalizationRejectionEmail queries

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/server/routers/specialAward.ts

@@ -4,7 +4,7 @@ import { Prisma } from '@prisma/client'
 import { router, protectedProcedure, adminProcedure } from '../trpc'
 import { logAudit } from '../utils/audit'
 import { processEligibilityJob } from '../services/award-eligibility-job'
-import { sendStyledNotificationEmail } from '@/lib/email'
+import { sendStyledNotificationEmail, getAwardSelectionNotificationTemplate } from '@/lib/email'
 import { generateInviteToken, getInviteExpiryMs } from '@/server/utils/invite'
 import type { PrismaClient } from '@prisma/client'
 
@@ -1229,6 +1229,31 @@ export const specialAwardRouter = router({
       return { needsInvite, hasAccount, totalProjects: eligibilities.length }
     }),
 
+  previewAwardSelectionEmail: adminProcedure
+    .input(z.object({
+      awardId: z.string(),
+      customMessage: z.string().optional(),
+    }))
+    .query(async ({ ctx, input }) => {
+      const award = await ctx.prisma.specialAward.findUniqueOrThrow({
+        where: { id: input.awardId },
+        select: { name: true },
+      })
+
+      const eligibleCount = await ctx.prisma.awardEligibility.count({
+        where: { awardId: input.awardId, eligible: true },
+      })
+
+      const template = getAwardSelectionNotificationTemplate(
+        'Team Member',
+        'Your Project',
+        award.name,
+        input.customMessage || undefined,
+      )
+
+      return { html: template.html, subject: template.subject, recipientCount: eligibleCount }
+    }),
+
   /**
    * Notify eligible projects that they've been selected for an award.
    * Generates invite tokens for passwordless users.