feat: multi-round messaging, login logo, applicant seed user

- Communication hub now supports selecting multiple rounds when sending
  to Round Jury or Round Applicants (checkbox list instead of dropdown)
- Recipients are unioned across selected rounds with deduplication
- Recipient details grouped by round when multiple rounds selected
- Added MOPC logo above "Welcome back" on login page
- Added matt@letsbe.solutions as seeded APPLICANT account

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

prisma/seed.ts

@@ -316,6 +316,7 @@ async function main() {
 
   const staffAccounts = [
     { email: 'matt@monaco-opc.com', name: 'Matt', role: UserRole.SUPER_ADMIN, password: '195260Mp!' },
+    { email: 'matt@letsbe.solutions', name: 'Matt (Applicant)', role: UserRole.APPLICANT, password: '195260Mp!' },
     { email: 'admin@monaco-opc.com', name: 'Admin', role: UserRole.PROGRAM_ADMIN, password: 'Admin123!' },
     { email: 'awards@monaco-opc.com', name: 'Award Director', role: UserRole.AWARD_MASTER, password: 'Awards123!' },
   ]
@@ -323,10 +324,10 @@ async function main() {
   const staffUsers: Record<string, string> = {}
   for (const account of staffAccounts) {
     const passwordHash = await bcrypt.hash(account.password, 12)
-    const isSuperAdmin = account.role === UserRole.SUPER_ADMIN
+    const needsPassword = account.role === UserRole.SUPER_ADMIN || account.role === UserRole.APPLICANT
     const user = await prisma.user.upsert({
       where: { email: account.email },
-      update: isSuperAdmin
+      update: needsPassword
         ? {
             status: UserStatus.ACTIVE,
             passwordHash,
@@ -348,11 +349,11 @@ async function main() {
         name: account.name,
         role: account.role,
         roles: [account.role],
-        status: isSuperAdmin ? UserStatus.ACTIVE : UserStatus.NONE,
-        passwordHash: isSuperAdmin ? passwordHash : null,
-        mustSetPassword: !isSuperAdmin,
-        passwordSetAt: isSuperAdmin ? new Date() : null,
-        onboardingCompletedAt: isSuperAdmin ? new Date() : null,
+        status: needsPassword ? UserStatus.ACTIVE : UserStatus.NONE,
+        passwordHash: needsPassword ? passwordHash : null,
+        mustSetPassword: !needsPassword,
+        passwordSetAt: needsPassword ? new Date() : null,
+        onboardingCompletedAt: needsPassword ? new Date() : null,
       },
     })
     staffUsers[account.email] = user.id