fix(test): raise bootCrmDb beforeAll timeout on slideshow suites

CI runners hit Jest's default 5s `beforeAll` timeout on
slideshowPublic.test.js's bootCrmDb call (~5.4s observed vs ~2s local —
runner-to-runner I/O variance, not a regression). Same hook shape on
slideshowAdmin.test.js is one slow runner away from the same failure.
Raise both to 30s so this stops blocking unrelated PRs branched off beta.

Adjacent to #654 — not strictly part of that fix but the only blocker
between #656 and a green CI right now.

backend/__tests__/routes/slideshowAdmin.test.js

@@ -57,6 +57,9 @@ async function insertEvent(db, adminId, over = {}) {
 describe('admin Live Slideshow endpoints', () => {
   let db; let cleanup; let app; let adminId; let token;
 
+  // Match slideshowPublic.test.js — bootCrmDb's full migration run intermittently
+  // exceeds Jest's default 5s `beforeAll` timeout on slower CI runners; raise
+  // it so this doesn't block PRs.
   beforeAll(async () => {
     ({ db, cleanup } = await bootCrmDb());
     ({ adminId } = await seedMinimal(db));
@@ -72,7 +75,7 @@ describe('admin Live Slideshow endpoints', () => {
     app.use((err, req, res, next) => {
       res.status(err.statusCode || err.status || 500).json({ error: err.message, code: err.code });
     });
-  });
+  }, 30000);
 
   afterAll(async () => { await cleanup(); });