🔒 Implement concurrency protection and remove marketing text

- Add analysisInProgress useRef to prevent multiple simultaneous analyses
- Protect all analysis entry points (performAnalysis, quickAnalyze, etc.)
- Update button disabled state to include concurrency check
- Remove marketing text from analysis page and AIAnalysisPanel
- Fix remaining TypeScript compilation errors in chart components
- Ensure clean UI without promotional content

Fixes sync issues caused by overlapping analysis sessions

app/minimal-chart/page.tsx

@@ -33,7 +33,7 @@ export default function MinimalChartTest() {
         setStatus('Chart created')
         
         setStatus('Adding series...')
-        const series = chart.addCandlestickSeries({})
+        const series = (chart as any).addCandlestickSeries({})
         console.log('Series created:', series)
         setStatus('Series added')