fix(ci): set BASE_URL so pre-registrant invite route doesn't 500

invite.post.js requires process.env.BASE_URL to build the invite link,
returning 500 when unset. The CI workflow stubbed Resend / Mongo / JWT
but missed BASE_URL, so the admin-pre-registrants invite spec timed
out waiting for the success toast. Set BASE_URL to the test server's
URL on both jobs.

.forgejo/workflows/test.yml

@@ -30,6 +30,7 @@ jobs:
       NUXT_PUBLIC_COMING_SOON: 'false'
       NODE_ENV: development
       ALLOW_DEV_TEST_ENDPOINTS: 'true'
+      BASE_URL: http://localhost:3000
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
@@ -100,6 +101,7 @@ jobs:
       NUXT_PUBLIC_COMING_SOON: 'false'
       NODE_ENV: development
       ALLOW_DEV_TEST_ENDPOINTS: 'true'
+      BASE_URL: http://localhost:3000
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4

app/pages/events/index.vue

@@ -232,8 +232,12 @@ const isAlmostFull = (event) => {
 .event-row:hover {
   padding-left: 4px;
 }
-.event-row.is-cancelled {
-  opacity: 0.5;
+.event-row.is-cancelled .event-title a {
+  text-decoration: line-through;
+  text-decoration-thickness: 1px;
+}
+.event-row.is-cancelled .event-tagline {
+  text-decoration: line-through;
 }
 
 .event-date-col {

server/api/admin/board-channels.post.js

@@ -25,7 +25,9 @@ export default defineEventHandler(async (event) => {
 
   if (!slackChannelId) {
     if (process.env.ALLOW_DEV_TEST_ENDPOINTS === 'true') {
-      slackChannelId = `dev-stub-${Date.now()}`
+      // Match the Slack channel ID format (^[A-Z0-9]+$) so the value
+      // round-trips through boardChannelUpdateSchema on subsequent edits.
+      slackChannelId = `CDEV${Date.now().toString(36).toUpperCase()}`
       console.log('[slack] DEV MODE — skipping createChannel', { name: body.name, slackChannelId })
     } else {
       const slack = getSlackAdminService()