Convert Audit log tab to pinned-header table matching other log pages

src/public/styles.css

@@ -826,10 +826,6 @@ select{appearance:none!important;-webkit-appearance:none!important;background-re
 .event-technical{margin-top:6px}
 .event-technical summary{padding:0;color:var(--blue);font-size:.7rem;cursor:pointer}
 .event-technical code{display:block;margin-top:5px;white-space:pre-wrap;overflow-wrap:anywhere;color:var(--muted);font-size:var(--font-size-xs)}
-#audit-list{max-height:min(52vh,620px);overflow:auto;border:1px solid var(--line);border-radius:var(--radius-2xl);background:var(--panel);scrollbar-gutter:stable}
-#audit-list .event-row{align-items:center;padding:18px 20px}
-#audit-list .activity-mark{width:8px;height:8px;min-width:8px;border-radius:50%;padding:0;font-size:0;background:var(--green);box-shadow:0 0 0 4px rgba(var(--green-rgb),.1)}
-#audit-list .activity-mark.bad{background:var(--danger);box-shadow:0 0 0 4px rgba(var(--danger-rgb),.09)}
 
 /* Diagnostic section headings & readiness panels */
 .diagnostic-section-heading{margin:20px 0 10px;padding:18px 20px;border:1px solid var(--line);border-bottom:0;border-radius:var(--radius-2xl) 15px 0 0;background:var(--panel)}