fix: correct daily work/break calculations and league back button

- ComputeDailyTotals: only assume working from dayStart when first event
  is 'out' (cross-midnight session); otherwise start idle. Fixes inflated
  work/break counts in reports, status, export, burnout, salary, and RPG.
- leagueToggleCallback: add settings back keyboard when RPG is disabled.
- webhook: add graceful HTTP server shutdown on context cancellation.

cmd/bot/webhook.go

@@ -5,6 +5,7 @@ import (
 	"log/slog"
 	"net/http"
 	"os"
+	"time"
 
 	tgbot "github.com/go-telegram/bot"
 
@@ -26,10 +27,25 @@ func startWebhook(ctx context.Context, b *tgbot.Bot, h *handler.Handler, webhook
 	tlsCert := os.Getenv("BOT_TLS_CERT")
 	tlsKey := os.Getenv("BOT_TLS_KEY")
 
+	server := &http.Server{
+		Addr:    listenAddr,
+		Handler: b.WebhookHandler(),
+	}
+
+	go func() {
+		<-ctx.Done()
+		slog.Info("shutting down webhook server")
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		if err := server.Shutdown(shutdownCtx); err != nil {
+			slog.Error("webhook server shutdown", "error", err)
+		}
+	}()
+
 	if tlsCert != "" && tlsKey != "" {
 		slog.Info("starting HTTPS webhook", "addr", listenAddr)
 		go func() {
-			if err := http.ListenAndServeTLS(listenAddr, tlsCert, tlsKey, b.WebhookHandler()); err != nil {
+			if err := server.ListenAndServeTLS(tlsCert, tlsKey); err != nil && err != http.ErrServerClosed {
 				slog.Error("HTTPS server", "error", err)
 				os.Exit(1)
 			}
@@ -37,7 +53,7 @@ func startWebhook(ctx context.Context, b *tgbot.Bot, h *handler.Handler, webhook
 	} else {
 		slog.Info("starting HTTP webhook (TLS by reverse proxy)", "addr", listenAddr)
 		go func() {
-			if err := http.ListenAndServe(listenAddr, b.WebhookHandler()); err != nil {
+			if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
 				slog.Error("HTTP server", "error", err)
 				os.Exit(1)
 			}