feat: reskin admin pages to zine design system

Migrate the entire admin section from the dark guild-* Tailwind theme
to the zine design system (dashed borders, CSS custom properties,
Brygada 1918 + Commit Mono, cream/dark mode palette).

- Replace admin top-nav layout with sidebar matching default layout
- Reskin dashboard, members, events, series management pages
- Reskin events/create and series/create form pages
- Add dev-only test login endpoint (GET /api/dev/test-login)
- Redirect duplicate admin/dashboard.vue to /admin
- Update CLAUDE.md design system docs

server/api/admin/members/invite.post.js

@@ -56,7 +56,7 @@ export default defineEventHandler(async (event) => {
         .replace(/\n/g, '<br>')
         .replace(/\{loginLink\}/g, loginButton)
 
-      const { error: sendError } = await resend.emails.send({
+      const { error: emailError } = await resend.emails.send({
         from: 'Ghost Guild <welcome@babyghosts.org>',
         to: [member.email],
         subject: 'You\'re invited to Ghost Guild',
@@ -64,8 +64,8 @@ export default defineEventHandler(async (event) => {
         html: emailHtml
       })
 
-      if (sendError) {
-        results.push({ memberId: member._id, email: member.email, success: false, error: sendError.message })
+      if (emailError) {
+        results.push({ memberId: member._id, email: member.email, success: false, error: emailError.message })
         continue
       }
 

server/api/dev/test-login.get.js

@@ -0,0 +1,42 @@
+import jwt from 'jsonwebtoken'
+import Member from '../../models/member.js'
+import { connectDB } from '../../utils/mongoose.js'
+
+export default defineEventHandler(async (event) => {
+  // Only allow in development
+  if (process.env.NODE_ENV === 'production') {
+    throw createError({ statusCode: 404, statusMessage: 'Not found' })
+  }
+
+  await connectDB()
+
+  // Find or create a test admin user
+  let member = await Member.findOne({ email: 'test-admin@ghostguild.dev' })
+
+  if (!member) {
+    member = await Member.create({
+      email: 'test-admin@ghostguild.dev',
+      name: 'Test Admin',
+      circle: 'founder',
+      contributionTier: '0',
+      role: 'admin',
+      status: 'active',
+    })
+  }
+
+  const config = useRuntimeConfig(event)
+  const token = jwt.sign(
+    { memberId: member._id, email: member.email },
+    config.jwtSecret,
+    { expiresIn: '7d' }
+  )
+
+  setCookie(event, 'auth-token', token, {
+    httpOnly: true,
+    secure: false,
+    sameSite: 'lax',
+    maxAge: 60 * 60 * 24 * 7,
+  })
+
+  await sendRedirect(event, '/admin', 302)
+})