Fix break tracking (out→in gap), add startup log, clean up /start message

internal/bot/totals.go

@@ -14,16 +14,12 @@ const (
 	StateOnBreak
 )
 
-// DailyTotals holds aggregated times for a single day.
 type DailyTotals struct {
 	TotalSeconds int64
 	BreakSeconds int64
 	PairCount    int
 }
 
-// ComputeDailyTotals pairs events with break inference.
-// Multi‑out sequences: first out ends work, second out starts break,
-// next in ends break, next out ends work, etc.
 func ComputeDailyTotals(events []db.Event) DailyTotals {
 	if len(events) == 0 {
 		return DailyTotals{}
@@ -40,34 +36,31 @@ func ComputeDailyTotals(events []db.Event) DailyTotals {
 	state := StateIdle
 
 	for _, e := range sorted {
-		switch {
-		case e.EventType == "in":
+		switch e.EventType {
+		case "in":
 			switch state {
-			case StateIdle, StateOnBreak:
-				if state == StateOnBreak {
-					breakTotal += e.OccurredAt - breakStart
-					breakStart = 0
-				}
+			case StateIdle:
+				workStart = e.OccurredAt
+				state = StateWorking
+			case StateOnBreak:
+				breakTotal += e.OccurredAt - breakStart
+				breakStart = 0
 				workStart = e.OccurredAt
 				state = StateWorking
-			// Working → ignore duplicate in (shouldn't happen)
-			case StateWorking:
-				// already working, ignore
 			}
-		case e.EventType == "out":
+		case "out":
 			switch state {
 			case StateWorking:
-				// End of work period
 				workTotal += e.OccurredAt - workStart
 				workStart = 0
 				pairs++
-				state = StateIdle
+				breakStart = e.OccurredAt
+				state = StateOnBreak
 			case StateIdle:
-				// Second consecutive out → break start
 				breakStart = e.OccurredAt
 				state = StateOnBreak
 			case StateOnBreak:
-				// Duplicate break start – ignore
+				breakStart = e.OccurredAt
 			}
 		}
 	}