Enhance AI Insight with new state management and PDF export functionality. Added selectedArea state to App for better context in reports. Introduced new markdown files for documentation on AI Insight improvements and setup instructions. Updated package dependencies and fixed TypeScript errors for improved stability.

services/performanceService.ts

@@ -59,7 +59,7 @@ class PerformanceService {
     new PerformanceObserver((entryList) => {
       const entries = entryList.getEntries();
       if (entries.length > 0) {
-        this.metrics.lcp = entries[entries.length - 1].startTime;
+        this.metrics.lcp = entries[entries.length - 1]?.startTime ?? null;
       }
     }).observe({ type: 'largest-contentful-paint', buffered: true });
   }
@@ -76,7 +76,7 @@ class PerformanceService {
     new PerformanceObserver((entryList) => {
       for (const entry of entryList.getEntries()) {
         if (!(entry as LayoutShift).hadRecentInput) {
-          this.metrics.cls += (entry as LayoutShift).value;
+          this.metrics.cls = (this.metrics.cls ?? 0) + (entry as LayoutShift).value;
         }
       }
     }).observe({ type: 'layout-shift', buffered: true });