Fix progress tracking synchronization issues

- Pre-generate sessionId on client side before API call to avoid race conditions
- Add small delays in progress tracker to ensure EventSource connection is established
- Improve logging and error handling in progress streaming
- Add connection confirmation messages in EventSource stream
- Fix TypeScript interface to include sessionId in AnalysisProgress

This should resolve the lag between actual analysis progress and progress bar display.

lib/progress-tracker.ts

@@ -36,7 +36,12 @@ class ProgressTracker extends EventEmitter {
     }
     
     this.sessions.set(sessionId, progress)
-    this.emit(`progress:${sessionId}`, progress)
+    
+    // Small delay to ensure EventSource connection is established before emitting
+    setTimeout(() => {
+      this.emit(`progress:${sessionId}`, progress)
+    }, 100)
+    
     return progress
   }
 
@@ -77,7 +82,11 @@ class ProgressTracker extends EventEmitter {
 
     this.sessions.set(sessionId, updatedProgress)
     console.log(`🔍 Emitting progress event for ${sessionId}, currentStep: ${updatedProgress.currentStep}`)
-    this.emit(`progress:${sessionId}`, updatedProgress)
+    
+    // Small delay to ensure proper event ordering and prevent race conditions
+    setTimeout(() => {
+      this.emit(`progress:${sessionId}`, updatedProgress)
+    }, 50)
   }
 
   updateTimeframeProgress(sessionId: string, current: number, total: number, currentTimeframe?: string): void {