feat: packages/email — Maizzle v6 + Tailwind CSS v4 HTML email templates

- New @sexy.pivoine.art/email package with @maizzle/framework@6.0.0-15
- Uses @maizzle/tailwindcss (TW v4 preset) with @theme brand tokens
  derived from the frontend's app.css oklch primary color
- LightningCSS automatically lowers oklch/lab to hex for email clients
- Real HTML template files (templates/layouts/main.html, verification.html,
  password-reset.html) — not JS template strings
- PostCSS `from` override so @import "@maizzle/tailwindcss" resolves from
  the email package's own node_modules
- Backend lib/email.ts now calls renderVerification/renderPasswordReset
  instead of inline HTML strings

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

packages/email/templates/password-reset.html

@@ -0,0 +1,44 @@
+---
+title: "Reset your password — sexy.pivoine.art"
+previewText: "You requested a password reset. Use the link below to set a new one."
+---
+
+<x-main>
+
+  <h1 class="text-[22px] font-semibold text-zinc-900 m-0 mb-2">
+    Reset your password
+  </h1>
+  <p class="text-zinc-500 m-0 mb-6">
+    We received a request to reset the password for your account. Click the button below to choose a new one.
+  </p>
+
+  <!-- CTA button -->
+  <table role="presentation" cellpadding="0" cellspacing="0" border="0" class="mb-6">
+    <tr>
+      <td class="rounded-lg" style="background: #b700d9">
+        <a href="{{ url }}"
+           class="inline-block px-8 py-[14px] text-[14px] font-semibold text-white no-underline rounded-lg"
+           style="background: #b700d9">
+          Reset my password
+        </a>
+      </td>
+    </tr>
+  </table>
+
+  <p class="text-[13px] text-zinc-500 m-0 mb-6">
+    This link expires in <strong class="text-zinc-700">1 hour</strong>.
+    If you did not request a password reset, no action is needed — your account remains secure.
+  </p>
+
+  <hr class="border-0 border-t border-zinc-100 my-6" />
+
+  <p class="text-[12px] text-zinc-400 m-0">
+    Button not working? Copy and paste this link into your browser:
+  </p>
+  <p class="text-[12px] m-0 mt-1">
+    <a href="{{ url }}" class="text-brand break-all" style="color: #b700d9">
+      {{ url }}
+    </a>
+  </p>
+
+</x-main>