fix(chart): add detailed error logging to debug 500 error

- Add step-by-step console logging in API route
- Show actual error message in dialog
- Add debug info section
- Wrap each section in try-catch to isolate failure point

memento-note/components/chart-suggestions-dialog.tsx

@@ -176,7 +176,14 @@ export function ChartSuggestionsDialog({
               <div className="text-center max-w-md">
                 <AlertCircle className="w-12 h-12 mx-auto mb-4 text-destructive" />
                 <h3 className="text-lg font-semibold mb-2">Error</h3>
-                <p className="text-muted-foreground">{response.error}</p>
+                <p className="text-sm text-muted-foreground mb-2">{response.error}</p>
+                <details className="text-left text-xs text-muted-foreground mt-4">
+                  <summary className="cursor-pointer hover:text-foreground">Debug info</summary>
+                  <pre className="mt-2 bg-muted p-2 rounded overflow-auto max-h-32">
+                    analyzedText: {response.analyzedText}
+                    {'\n'}detectedData: {response.detectedData}
+                  </pre>
+                </details>
               </div>
             </div>
           ) : !response?.hasData ? (