feature: add DuckDuckGo weather and stock widget extractors

Add weather.go with GetWeather() for extracting structured weather data
(location, temp, conditions, forecast) and stock.go with GetStockQuote()
and GetStockChart() for stock data extraction and chart screenshots.

Both include mock-based tests. CSS selectors may need tuning against
the live site since DuckDuckGo's React-rendered widgets use dynamic
class names.

Closes #25, #26
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

sites/duckduckgo/stock.go

@@ -0,0 +1,144 @@
+package duckduckgo
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"time"
+
+	"gitea.stevedudenhoeffer.com/steve/go-extractor"
+	"gitea.stevedudenhoeffer.com/steve/go-extractor/sites/internal/parse"
+)
+
+// StockData holds structured stock quote information from DuckDuckGo.
+type StockData struct {
+	Symbol    string
+	Name      string
+	Price     float64
+	Change    float64
+	ChangePct float64
+}
+
+// StockPeriod represents a time period for stock charts.
+type StockPeriod string
+
+const (
+	Period1D  StockPeriod = "1D"
+	Period5D  StockPeriod = "5D"
+	Period1M  StockPeriod = "1M"
+	PeriodYTD StockPeriod = "YTD"
+	Period1Y  StockPeriod = "1Y"
+	Period5Y  StockPeriod = "5Y"
+	PeriodAll StockPeriod = "All"
+)
+
+// GetStockQuote extracts structured stock data from DuckDuckGo's stock widget.
+func (c Config) GetStockQuote(ctx context.Context, b extractor.Browser, symbol string) (*StockData, error) {
+	c = c.validate()
+
+	u := c.ToSearchURL(symbol + " stock")
+
+	slog.Info("fetching stock", "url", u, "symbol", symbol)
+	doc, err := b.Open(ctx, u.String(), extractor.OpenPageOptions{})
+	if err != nil {
+		return nil, fmt.Errorf("failed to open stock page: %w", err)
+	}
+	defer extractor.DeferClose(doc)
+
+	timeout := 10 * time.Second
+	if err := doc.WaitForNetworkIdle(&timeout); err != nil {
+		slog.Warn("WaitForNetworkIdle failed", "err", err)
+	}
+
+	return extractStock(doc)
+}
+
+// GetStockQuote is a convenience function using DefaultConfig.
+func GetStockQuote(ctx context.Context, b extractor.Browser, symbol string) (*StockData, error) {
+	return DefaultConfig.GetStockQuote(ctx, b, symbol)
+}
+
+// GetStockChart screenshots the stock chart widget for a given period.
+func (c Config) GetStockChart(ctx context.Context, b extractor.Browser, symbol string, period StockPeriod) ([]byte, error) {
+	c = c.validate()
+
+	u := c.ToSearchURL(symbol + " stock")
+
+	slog.Info("fetching stock chart", "url", u, "symbol", symbol, "period", period)
+	doc, err := b.Open(ctx, u.String(), extractor.OpenPageOptions{})
+	if err != nil {
+		return nil, fmt.Errorf("failed to open stock page: %w", err)
+	}
+	defer extractor.DeferClose(doc)
+
+	timeout := 10 * time.Second
+	if err := doc.WaitForNetworkIdle(&timeout); err != nil {
+		slog.Warn("WaitForNetworkIdle failed", "err", err)
+	}
+
+	// Click the period selector if not 1D (default)
+	if period != Period1D {
+		selector := fmt.Sprintf(`div.module__content button[data-period="%s"]`, string(period))
+		_ = doc.ForEach(selector, func(n extractor.Node) error {
+			return n.Click()
+		})
+
+		// Wait for chart to update
+		chartTimeout := 5 * time.Second
+		if err := doc.WaitForNetworkIdle(&chartTimeout); err != nil {
+			slog.Warn("WaitForNetworkIdle after period click failed", "err", err)
+		}
+	}
+
+	// Screenshot the stock module
+	modules := doc.Select("div.module__content")
+	if len(modules) == 0 {
+		return nil, fmt.Errorf("stock module not found")
+	}
+
+	return modules[0].Screenshot()
+}
+
+// GetStockChart is a convenience function using DefaultConfig.
+func GetStockChart(ctx context.Context, b extractor.Browser, symbol string, period StockPeriod) ([]byte, error) {
+	return DefaultConfig.GetStockChart(ctx, b, symbol, period)
+}
+
+func extractStock(doc extractor.Node) (*StockData, error) {
+	var data StockData
+
+	// Symbol
+	syms := doc.Select("div.module--stocks .module__title__link")
+	if len(syms) > 0 {
+		data.Symbol, _ = syms[0].Text()
+	}
+
+	// Name
+	names := doc.Select("div.module--stocks .module__subtitle")
+	if len(names) > 0 {
+		data.Name, _ = names[0].Text()
+	}
+
+	// Price
+	prices := doc.Select("div.module--stocks .module__price")
+	if len(prices) > 0 {
+		txt, _ := prices[0].Text()
+		data.Price = parse.NumericOnly(txt)
+	}
+
+	// Change
+	changes := doc.Select("div.module--stocks .module__price-change")
+	if len(changes) > 0 {
+		txt, _ := changes[0].Text()
+		data.Change = parse.NumericOnly(txt)
+	}
+
+	// Change percentage
+	pcts := doc.Select("div.module--stocks .module__price-change-pct")
+	if len(pcts) > 0 {
+		txt, _ := pcts[0].Text()
+		data.ChangePct = parse.NumericOnly(txt)
+	}
+
+	return &data, nil
+}