feat(deps): adopt react-email for portal-auth template

Migrates the activation + reset email templates from hand-strung HTML
strings to React components rendered via @react-email/components.

Concrete wins this lands:
- React auto-escapes interpolation — drops the hand-rolled escapeHtml()
  helper. Eliminates the entire class of "I forgot to escape" XSS bugs.
- @react-email primitives (Button, Hr, Link, Text) render to
  Outlook/Gmail/AppleMail-safe inline-styled HTML.
- JSX over template strings makes the templates editable / reviewable.
- Sets the pattern for the remaining 7 templates (crm-invite,
  document-signing, inquiry-*, notification-digest, admin-email-change,
  residential-inquiry). Migrate opportunistically when those files are
  next touched.

The shell (logo, blurred background, table-based wrapper) stays via
renderShell so this is a strictly inner-body migration — visual parity
preserved.

Vitest config: added @vitejs/plugin-react so .tsx files imported by
tests (transitively via the service that uses the template) transform
correctly under Next's tsconfig `jsx: 'preserve'` setting.

Verified: tsc clean, vitest 1293/1293 pass.

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

package.json

@@ -56,11 +56,13 @@
     "@radix-ui/react-switch": "^1.2.6",
     "@radix-ui/react-tabs": "^1.1.13",
     "@radix-ui/react-tooltip": "^1.2.8",
+    "@react-email/components": "^1.0.12",
     "@socket.io/redis-adapter": "^8.3.0",
     "@tanstack/query-broadcast-client-experimental": "^5.100.10",
     "@tanstack/react-query": "^5.100.10",
     "@tanstack/react-query-devtools": "^5.100.10",
     "@tanstack/react-table": "^8.21.3",
+    "@tanstack/react-virtual": "^3.13.24",
     "@types/pdfkit": "^0.17.6",
     "archiver": "^7.0.1",
     "better-auth": "^1.6.10",
@@ -92,6 +94,7 @@
     "react-day-picker": "^10.0.0",
     "react-dom": "^19.2.6",
     "react-easy-crop": "^5.5.7",
+    "react-email": "^6.1.3",
     "react-hook-form": "^7.75.0",
     "recharts": "^3.8.1",
     "sharp": "^0.34.5",
@@ -120,6 +123,7 @@
     "@types/nodemailer": "^8.0.0",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^6.0.1",
     "@vitest/coverage-v8": "^4.1.6",
     "autoprefixer": "^10.5.0",
     "dotenv": "^17.4.2",