🔒 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/direct-chart/page.tsx

@@ -27,7 +27,7 @@ export default function DirectChart() {
         })
         console.log('Chart created')
         
-        const series = chart.addCandlestickSeries({
+        const series = (chart as any).addCandlestickSeries({
           upColor: '#26a69a',
           downColor: '#ef5350',
         })