feat(core): sync framework security hardening and accessibility improvements

- add util.Go with panic recovery for background goroutines
- add util.EscapeLike and explicit ESCAPE clause for SQL LIKE queries
- add DummyCheckPassword and subtle.ConstantTimeCompare against timing attacks
- enforce session ID rotation upon login/oauth callback to prevent session fixation
- add sliding window login failure rate limiting and oauth state rate limiting
- fix redis client capture race in pubsub listeners and wait on stop channel
- adjust global --primary to oklch(51.1% 0.262 276.966) for WCAG AA contrast
- fix semantic heading levels and missing aria-labels across UI components
- document security, concurrency, and a11y standards in AGENTS.md

frontend/app/(main)/admin/logs/components/access-analytics.tsx

@@ -227,6 +227,7 @@ export function AccessAnalytics() {
             variant='ghost'
             size='icon'
             className='size-8'
+            aria-label={t('refresh')}
             onClick={fetchAnalytics}
             disabled={loading}
           >