feat: add advanced Recharts price chart with SMA and Bollinger Bands

[OG-wura]

Close #29

PR Description

Summary

Added an interactive advanced chart component to the homepage using Recharts. The chart displays price action with custom trading indicators including SMA 10, SMA 20, and Bollinger Bands.

What changed

• Added AdvancedChart.tsx
  • Implements a responsive line chart with:
    • close price line
    • SMA 10 and SMA 20 indicator lines
    • Bollinger Bands rendered as upper/lower bands
    • tooltip, legend, and brush interaction
  • Uses sample price data and internal indicator calculations
• Updated page.tsx
  • Imported and inserted AdvancedChart between Hero and Leaderboard
• Updated package.json
  • Added new dependency: recharts

Testing

1. Run npm install
2. Run npm run dev
3. Open http://localhost:3000
4. Verify that the homepage renders:
   • the advanced chart section
   • price data line
   • SMA 10 / SMA 20 lines
   • Bollinger Bands and interactive tooltip/brush

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