Revert to FinViz daily charts, remove custom chart generation

Remove Finnhub + QuickChart candlestick chart code. Chart generation will be handled by a separate service in the future.

Simplified back to FinViz daily charts for reliability.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

bot.py

@@ -169,20 +169,9 @@ class StockBot(commands.Bot):
         embed.add_field(name="Change", value=change_str, inline=True)
         embed.add_field(name="Previous Close", value=f"${stock_data['previous_close']}", inline=True)
 
-        # Add 5-minute intraday chart from Finnhub + QuickChart
-        if hasattr(self.stock_api, 'get_intraday_candles'):
-            candles = self.stock_api.get_intraday_candles(ticker, resolution=5, days_back=1)
-            if candles:
-                chart_url = self.stock_api.generate_chart_url(ticker, candles)
-                embed.set_image(url=chart_url)
-            else:
-                # Fallback to FinViz daily chart if intraday data unavailable
-                chart_url = f"https://finviz.com/chart.ashx?t={ticker}&ty=c&ta=1&p=d&s=l"
-                embed.set_image(url=chart_url)
-        else:
-            # Fallback for non-Finnhub APIs
-            chart_url = f"https://finviz.com/chart.ashx?t={ticker}&ty=c&ta=1&p=d&s=l"
-            embed.set_image(url=chart_url)
+        # Add FinViz daily chart
+        chart_url = f"https://finviz.com/chart.ashx?t={ticker}&ty=c&ta=1&p=d&s=l"
+        embed.set_image(url=chart_url)
 
         market_status = "🟢 Market Open" if stock_data['market_open'] else "🔴 Market Closed"
         embed.set_footer(text=f"{market_status}")