fix(graph): T1 hardening — localStorage try/catch + rAF throttle on redraw

После T1 code-quality review: 2 Important issues из spec §9 mitigation list. (1) try/catch обернул read/write localStorage — в Edge InPrivate / quota-exceeded не падает, fallback на default 300. (2) network.redraw() rAF-throttled через redrawScheduled flag — устраняет potential jank при fast drag на медленном hardware (mousemove может fire'ить >60Hz).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/automation-graph.html

@@ -1200,16 +1200,26 @@ document.getElementById('btn-clear').addEventListener('click', () => {
 const LEGEND_STORAGE_KEY = 'liderra-map-legend-width';
 const LEGEND_MIN_W = 300, LEGEND_MAX_W = 900;
 
+let redrawScheduled = false;
 function applyLegendWidth(w) {
   const clamped = Math.max(LEGEND_MIN_W, Math.min(LEGEND_MAX_W, w));
   const panel = document.getElementById('legend-panel');
   panel.style.width = clamped + 'px';
   panel.style.minWidth = clamped + 'px';
-  if (typeof network !== 'undefined' && network) network.redraw();
+  if (typeof network !== 'undefined' && network && !redrawScheduled) {
+    redrawScheduled = true;
+    requestAnimationFrame(() => {
+      redrawScheduled = false;
+      network.redraw();
+    });
+  }
 }
 
 function restoreLegendWidth() {
-  const saved = parseInt(localStorage.getItem(LEGEND_STORAGE_KEY) || '300', 10);
+  let saved = 300;
+  try {
+    saved = parseInt(localStorage.getItem(LEGEND_STORAGE_KEY) || '300', 10);
+  } catch (e) { /* private mode or quota — keep default */ }
   applyLegendWidth(saved);
 }
 
@@ -1234,7 +1244,7 @@ function restoreLegendWidth() {
     handle.classList.remove('dragging');
     document.body.style.userSelect = '';
     const w = parseInt(document.getElementById('legend-panel').style.width, 10);
-    localStorage.setItem(LEGEND_STORAGE_KEY, String(w));
+    try { localStorage.setItem(LEGEND_STORAGE_KEY, String(w)); } catch (e) { /* private mode or quota */ }
   });
 })();