feat: add break threshold picker UI to settings with preset values

Replaces the text-only instructions with a grid of common break thresholds (0/5/10/15/30 min, 1/2/4/8h) matching the accent picker pattern.

internal/bot/settings.go

@@ -272,16 +272,67 @@ func (h *Handler) reportTimeCallback(ctx context.Context, chatID int64, msgID in
 	h.editText(ctx, chatID, msgID, text, &kb)
 }
 
-// breakThresholdCallback shows the current break threshold and how to change it.
+// breakThresholdCallback shows the break threshold picker.
 func (h *Handler) breakThresholdCallback(ctx context.Context, chatID int64, msgID int, callbackID string) {
 	h.answerCb(ctx, callbackID)
 	bt := h.getTodayBreakThreshold(chatID)
-	text := fmt.Sprintf("Current break threshold: %dm\n\nUse /setbreak <minutes> to change it (0-480).\nGaps shorter than the threshold are absorbed into work time.", bt/60)
-	kb := models.InlineKeyboardMarkup{
-		InlineKeyboard: [][]models.InlineKeyboardButton{
-			{{Text: "Back to Settings", CallbackData: "back_settings"}},
-		},
+	text, kb := h.buildBreakThresholdKeyboard(bt)
+	h.editText(ctx, chatID, msgID, text, &kb)
+}
+
+// buildBreakThresholdKeyboard returns the break threshold picker.
+func (h *Handler) buildBreakThresholdKeyboard(current int64) (string, models.InlineKeyboardMarkup) {
+	values := []int{0, 5, 10, 15, 30, 60, 120, 240, 480}
+	labels := map[int]string{
+		0:   "0 (off)",
+		5:   "5 min",
+		10:  "10 min",
+		15:  "15 min",
+		30:  "30 min",
+		60:  "1h",
+		120: "2h",
+		240: "4h",
+		480: "8h",
 	}
+	rows := [][]models.InlineKeyboardButton{}
+	for _, v := range values {
+		label := labels[v]
+		if int(current/60) == v {
+			label = "> " + label
+		}
+		rows = append(rows, []models.InlineKeyboardButton{
+			{Text: label, CallbackData: fmt.Sprintf("breakthreshold_%d", v)},
+		})
+	}
+	rows = append(rows, []models.InlineKeyboardButton{
+		{Text: "Back to Settings", CallbackData: "back_settings"},
+	})
+	return "Select break threshold:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
+}
+
+// selectBreakThreshold saves the chosen break threshold and returns to settings.
+func (h *Handler) selectBreakThreshold(ctx context.Context, chatID int64, msgID int, callbackID, valStr string) {
+	h.answerCb(ctx, callbackID)
+	mins, err := strconv.Atoi(valStr)
+	if err != nil || mins < 0 || mins > 480 {
+		return
+	}
+	user, err := h.getOrCreateUser(chatID)
+	if err != nil {
+		return
+	}
+	now := time.Now()
+	date := now.Format("2006-01-02")
+	day, err := h.DB.GetOrCreateDay(user.ID, date)
+	if err != nil {
+		return
+	}
+	day.MinBreakThreshold = int64(mins) * 60
+	if err := h.DB.UpdateDay(day); err != nil {
+		return
+	}
+	bt := h.getTodayBreakThreshold(chatID)
+	text, kb := h.buildSettingsKeyboard(user, bt)
 	h.editText(ctx, chatID, msgID, text, &kb)
 }