a11y: Web Interface Guidelines — 19 правок доступности и семантики

- base.html: lang динамический, meta theme-color, skip-link, убран дубль Dashboard
- Фильтры: labels на search/select, type=search, placeholder с …, autocomplete=off
- llm-retry: <span> → <button> во всех шаблонах (_llm_report, scan, package)
- sortable th: tabindex=0, role=button через JS + keyboard handler
- sort-icon: aria-hidden=true
- style.css: color-scheme:dark, prefers-reduced-motion, tabular-nums, touch-action
- app.js: clipboard fallback для не-HTTPS

guarddog_nexus/web/static/style.css

@@ -1,5 +1,7 @@
 /* GuardDog Nexus — Web UI styles */
 
+html { color-scheme: dark; }
+
 /* ------------------------------------------------------------------ */
 /* Status / severity colours                                           */
 /* ------------------------------------------------------------------ */
@@ -35,10 +37,16 @@
 /* ------------------------------------------------------------------ */
 /* Tables                                                             */
 /* ------------------------------------------------------------------ */
-table            { font-size: 0.9rem; }
+table            { font-size: 0.9rem; touch-action: manipulation; }
 table.compact    { font-size: 0.82rem; }
 table.compact th,
 table.compact td { padding: 0.35rem 0.5rem; }
+table td:first-child { font-variant-numeric: tabular-nums; }
+
+@media (prefers-reduced-motion: reduce) {
+    .spinner { animation: none; }
+    .status-scanning { animation: none; }
+}
 
 @media (max-width: 768px) {
     table { display: block; overflow-x: auto; white-space: nowrap; }
@@ -182,9 +190,14 @@ table.compact td { padding: 0.35rem 0.5rem; }
     font-size: 0.7rem;
     opacity: 0.5;
     cursor: pointer;
+    border: none;
     border-bottom: 1px dashed;
+    background: none;
+    padding: 0;
+    color: inherit;
 }
 .llm-retry:hover { opacity: 0.8; }
+.llm-retry:focus-visible { outline: 2px solid #2196f3; outline-offset: 2px; }
 
 .llm-disclaimer {
     margin-top: 0.6rem;