Update stock notifications with company names and new schedule times

Add full company names to stock price notifications displayed alongside tickers. Update scheduled message times from hourly to three specific times: market open (9:30 AM ET), noon (12:00 PM ET), and market close (4:00 PM ET).

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

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

stock_api/yahoo.py

@@ -23,6 +23,15 @@ class YahooFinanceAPI(StockAPIBase):
         try:
             stock = yf.Ticker(ticker)
 
+            # Get company name from info
+            company_name = None
+            try:
+                info = stock.info
+                company_name = info.get('longName') or info.get('shortName') or ticker.upper()
+            except Exception as e:
+                logger.warning(f"Could not fetch company name for {ticker}: {e}")
+                company_name = ticker.upper()
+
             # Use history() method instead of info to avoid rate limiting
             # Get last 2 days of data to calculate change
             hist = stock.history(period="2d")
@@ -48,6 +57,7 @@ class YahooFinanceAPI(StockAPIBase):
 
             return {
                 'ticker': ticker.upper(),
+                'company_name': company_name,
                 'current_price': round(current_price, 2),
                 'previous_close': round(previous_close, 2),
                 'change_dollar': round(change_dollar, 2),