refactor: break up large functions, add RPG/league/salary/burnout, fix bugs, add tests

- Refactor GenerateMonthlyReport (198→70), HandleCallback (128→85),
  handleHistoryCallback (131→38), handleExportCallback (100→25),
  checkAchievements (86→25) into extracted helper functions
- Add RPG system (XP, levels, streak, achievements, burnout)
- Add WorkTime League leaderboard
- Add salary estimation with configurable currency/rate
- Add input sanitization (SanitizeNote, SanitizeDisplayName)
- Add settings select-style pickers for toggles (report, RPG, league)
- Add break threshold inline picker UI
- Add event notes with pending state and /note command
- Add multi-calendar support (Jalali, Hijri)
- Add Excel export with theme picker
- Fix: getTodayBreakThreshold uses user's timezone (was UTC)
- Fix: acknowledgeCallback passes real callback ID
- Fix: currency symbol safety with currencySymbol() helper
- Fix: count work hours in summary on day-off days
- Fix: unsilence all error returns from SQL Exec/Bot API/migrations
- Remove stale db/schema.sql and unreferenced computeWeekTotals
- Extract constants: DateLayout, TimeLayout, secondsPerHour, etc.
- Add 12 new tests (XP, salary, sanitize, currency, dateutil)
- Remove duplicate package doc comment in totals.go

internal/bot/report.go

@@ -32,7 +32,7 @@ func (h *Handler) buildStatusText(chatID int64) string {
 	last, err := h.DB.GetLastEvent(user.ID)
 	if err == nil && last != nil && last.EventType == "in" {
 		loc := loadLocation(user.Timezone)
-		t := time.Unix(last.OccurredAt, 0).In(loc).Format("15:04")
+		t := time.Unix(last.OccurredAt, 0).In(loc).Format(TimeLayout)
 		text += fmt.Sprintf("\nStatus: working since %s", t)
 	} else {
 		text += "\nStatus: not working"
@@ -49,14 +49,33 @@ func (h *Handler) buildStatusText(chatID int64) string {
 		text += fmt.Sprintf("\nToday: %s worked", formatDuration(totals.TotalSeconds))
 	}
 
-	loc := loadLocation(user.Timezone)
-	weekTotal := h.computeWeekTotals(user, loc)
-	if weekTotal > 0 {
-		text += fmt.Sprintf("\nWeek: %s", formatDuration(weekTotal))
+	// Salary info if configured
+	st, _ := h.DB.GetOrCreateSettings(user.ID)
+	if st.HourlyRate > 0 {
+		if events, err := h.DB.EventsForDayByDayID(day.ID); err == nil && len(events) > 0 {
+			loc := loadLocation(user.Timezone)
+			now := time.Now().In(loc)
+			y, m, d := now.Date()
+			dayStart := time.Date(y, m, d, 0, 0, 0, 0, loc).Unix()
+			dayEnd := now.Unix()
+			totals := ComputeDailyTotals(events, day.MinBreakThreshold, dayStart, dayEnd)
+			salLine := h.buildSalaryStatus(user.ID, totals.TotalSeconds)
+			if salLine != "" {
+				text += salLine
+			}
+		}
 	}
 
-	if day.MinBreakThreshold > 0 {
-		text += fmt.Sprintf("\nBreak threshold: %dm", day.MinBreakThreshold/60)
+	// RPG info if enabled
+	if st.RPGEnabled {
+		stats, _ := h.DB.GetOrCreateRPGStats(user.ID)
+		if stats != nil {
+			text += fmt.Sprintf("\nLevel: %d | XP: %d", stats.Level, stats.XP)
+			rankText := h.buildLeagueRankText(user.ID)
+			if rankText != "" {
+				text += fmt.Sprintf(" | %s", rankText)
+			}
+		}
 	}
 
 	text += "\n\nChoose an action:"
@@ -87,7 +106,7 @@ func (h *Handler) buildDailyReport(user *db.User, day *db.Day, events []db.Event
 	y, m, d := parseGregorianDateKey(day.Date)
 	dayStart := time.Date(y, time.Month(m), d, 0, 0, 0, 0, loc).Unix()
 	now := time.Now().In(loc)
-	todayStr := now.Format("2006-01-02")
+	todayStr := now.Format(DateLayout)
 	dayEnd := time.Date(y, time.Month(m), d, 23, 59, 59, 0, loc).Unix()
 	if day.Date == todayStr {
 		dayEnd = now.Unix()
@@ -101,7 +120,7 @@ func (h *Handler) buildDailyReport(user *db.User, day *db.Day, events []db.Event
 	lines += "\n\n"
 
 	for _, e := range events {
-		t := time.Unix(e.OccurredAt, 0).In(loc).Format("15:04")
+		t := time.Unix(e.OccurredAt, 0).In(loc).Format(TimeLayout)
 		label := "IN"
 		if e.EventType == "out" {
 			label = "OUT"
@@ -122,6 +141,13 @@ func (h *Handler) buildDailyReport(user *db.User, day *db.Day, events []db.Event
 		formatDuration(totals.TotalSeconds),
 		formatDuration(totals.BreakSeconds))
 
+	// Salary info if configured
+	st, _ := h.DB.GetOrCreateSettings(user.ID)
+	if st.HourlyRate > 0 {
+		est := computeDailySalary(totals.TotalSeconds, st.HourlyRate)
+		lines += fmt.Sprintf("  Salary: %s\n", SalaryEstimate{GrossEarning: est}.formatSalary(st.Currency))
+	}
+
 	return lines
 }
 
@@ -137,7 +163,7 @@ func (h *Handler) SendDailyReport(ctx context.Context, userID int64, chatID int6
 		loc = time.UTC
 	}
 	now := time.Now().In(loc)
-	today := now.Format("2006-01-02")
+	today := now.Format(DateLayout)
 
 	day, err := h.DB.GetOrCreateDay(user.ID, today)
 	if err != nil {