Subject bar under the header in Quizzes and Lessons, synced between tabs; bidi fix for Latin math in RTL text

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/components/NodeIcon.tsx

@@ -1,5 +1,5 @@
 import {
-  BookOpen, Brain, Compass, Grid3x3, LineChart, Play, Repeat, Sigma, Sparkles, TrendingUp,
+  BarChart3, BookOpen, Brain, Compass, Grid3x3, LineChart, Network, Play, Repeat, Sigma, Sparkles, TrendingUp,
   type LucideIcon,
 } from 'lucide-react';
 
@@ -8,7 +8,7 @@ import {
  * مجموعه‌ی کوچک در باندل است تا کلِ کتابخانه‌ی آیکن بار نشود.
  */
 const ICONS: Record<string, LucideIcon> = {
-  Grid3x3, TrendingUp, LineChart, Sigma, Compass, Repeat, BookOpen, Sparkles, Brain, Play,
+  Grid3x3, TrendingUp, LineChart, Sigma, Compass, Repeat, BookOpen, Sparkles, Brain, Play, BarChart3, Network,
 };
 
 const FALLBACK: LucideIcon[] = [Grid3x3, TrendingUp, LineChart, Sigma, Compass, Repeat, BookOpen, Sparkles, Brain];