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.

internal/domain/totals.go

@@ -18,7 +18,7 @@ func ComputeDailyTotals(events []Event, minBreakThreshold int64, dayStart, dayEn
 	state := StateIdle
 	var workStart, breakStart int64
 
-	if dayStart > 0 {
+	if dayStart > 0 && sorted[0].EventType == "out" {
 		state = StateWorking
 		workStart = dayStart
 	} else if sorted[0].EventType == "out" {