fix: harden admin actions, search, sanitization and repo hygiene

- Split approve/dismiss application workflows with distinct audit logs,
  rate-limited guards and real error logging
- Validate article status/date/id input and stop resetting publishedAt
  on every update
- Validate guild updates (state, forum enums, non-empty name) behind
  rate-limited guard
- Fix scheduled-article publishing (ignore NULL dates, set updatedAt,
  type-safe predicates)
- Harden admin search API (LIKE escaping, query cap, per-user
  rate limit, round-robin result cap) and fix search dialog
  abort/res.ok/loading races
- Lock down HTML sanitizer to an allowlist profile and add XSS tests
- Improve mobile nav accessibility (unique id, dialog role, focus
  management, scroll lock, outside close)
- Log swallowed server errors instead of silent catch blocks
- Remove dead eslint config, drop unused dompurify deps, restore knip
  CI step, add Playwright config with smoke spec

.gitea/workflows/ci.yaml

@@ -47,6 +47,9 @@ jobs:
           BCRYPT_ROUNDS: 4
         run: pnpm test --maxWorkers=1
 
+      - name: Knip (unused files/exports)
+        run: pnpm knip
+
   # ─────────────────────────────────────────────
   # Docker build & deploy
   # Draait op de host (self-hosted) zodat Docker