feat: Add Insights tab to dashboard for physics visualizations

Dashboard integration for Study Insights module (SYS_16):
- Backend: New /api/insights/ routes for generating and viewing insights
- Frontend: New Insights.tsx page with Plotly visualization
- Navigation: Added Insights tab between Analysis and Results

Available insight types:
- Zernike WFE (wavefront error for mirrors)
- Stress Field (Von Mises stress contours)
- Modal Analysis (natural frequencies/mode shapes)
- Thermal Field (temperature distribution)
- Design Space (parameter-objective exploration)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

atomizer-dashboard/frontend/src/components/layout/Sidebar.tsx

@@ -11,7 +11,8 @@ import {
   CheckCircle,
   Clock,
   Zap,
-  Terminal
+  Terminal,
+  Eye
 } from 'lucide-react';
 import clsx from 'clsx';
 import { useStudy } from '../../context/StudyContext';
@@ -63,6 +64,7 @@ export const Sidebar = () => {
         { to: '/setup', icon: Settings, label: 'Setup' },
         { to: '/dashboard', icon: Activity, label: 'Live Tracker' },
         { to: '/analysis', icon: TrendingUp, label: 'Analysis' },
+        { to: '/insights', icon: Eye, label: 'Insights' },
         { to: '/results', icon: FileText, label: 'Results' },
       ]
     : [