add year navigation: year row at top of calendar, clickable year in export, shared buildYearPicker with 12-year grid

internal/bot/calendar.go

@@ -79,6 +79,37 @@ func (h *Handler) handleHistoryCallback(ctx context.Context, chatID int64, msgID
 		h.editCalendar(ctx, chatID, msgID, y, m)
 		return
 	}
+	// Navigate to previous year
+	if n, _ := fmt.Sscanf(data, "cal_prev_year_%d_%d", &y, &m); n == 2 {
+		h.editCalendar(ctx, chatID, msgID, y, m)
+		return
+	}
+	// Navigate to next year
+	if n, _ := fmt.Sscanf(data, "cal_next_year_%d_%d", &y, &m); n == 2 {
+		h.editCalendar(ctx, chatID, msgID, y, m)
+		return
+	}
+	// Show year picker from calendar
+	if n, _ := fmt.Sscanf(data, "cal_show_years_%d_%d", &y, &m); n == 2 {
+		h.editCalendarYearPicker(ctx, chatID, msgID, y, m, y)
+		return
+	}
+	// Navigate year block in picker
+	var startY, refY, refM int
+	if n, _ := fmt.Sscanf(data, "cal_years_%d_%d_%d", &startY, &refY, &refM); n == 3 {
+		h.editCalendarYearPicker(ctx, chatID, msgID, startY+6, refM, refY)
+		return
+	}
+	// Select year from picker
+	if n, _ := fmt.Sscanf(data, "cal_year_%d", &y); n == 1 {
+		h.editCalendar(ctx, chatID, msgID, y, 1)
+		return
+	}
+	// Back from year picker to calendar
+	if n, _ := fmt.Sscanf(data, "cal_years_back_%d_%d", &y, &m); n == 2 {
+		h.editCalendar(ctx, chatID, msgID, y, m)
+		return
+	}
 	// Open a specific day
 	if n, _ := fmt.Sscanf(data, "cal_day_%s", &date); n == 1 && len(date) == 10 {
 		h.editDayView(ctx, chatID, msgID, user, date, loc)
@@ -148,6 +179,36 @@ func (h *Handler) sendCalendar(ctx context.Context, chatID int64, msgID int, yea
 	h.editCalendar(ctx, chatID, msgID, year, month)
 }
 
+// buildYearPicker returns a 12-year grid keyboard centered on centerYear.
+// cbPrefix is "cal_" or "exp_". backData is the callback for the Back button.
+// navSuffix is appended to the nav callbacks to carry reference info (e.g. "_2026_3").
+func buildYearPicker(cbPrefix, backData, navSuffix string, centerYear int) models.InlineKeyboardMarkup {
+	blockStart := centerYear - 6
+	kbRows := [][]models.InlineKeyboardButton{
+		{
+			{Text: "< 12", CallbackData: fmt.Sprintf("%syears_%d%s", cbPrefix, blockStart-12, navSuffix)},
+			{Text: fmt.Sprintf("%d", centerYear), CallbackData: "noop"},
+			{Text: "12 >", CallbackData: fmt.Sprintf("%syears_%d%s", cbPrefix, blockStart+12, navSuffix)},
+		},
+	}
+	for i := 0; i < 12; i += 4 {
+		row := []models.InlineKeyboardButton{}
+		for j := i; j < i+4; j++ {
+			y := blockStart + j
+			row = append(row, models.InlineKeyboardButton{
+				Text: fmt.Sprintf("%d", y), CallbackData: fmt.Sprintf("%syear_%d", cbPrefix, y),
+			})
+		}
+		kbRows = append(kbRows, row)
+	}
+	if backData != "" {
+		kbRows = append(kbRows, []models.InlineKeyboardButton{
+			{Text: "Back", CallbackData: backData},
+		})
+	}
+	return models.InlineKeyboardMarkup{InlineKeyboard: kbRows}
+}
+
 // editCalendar renders a monthly calendar grid with event indicators and navigation.
 func (h *Handler) editCalendar(ctx context.Context, chatID int64, msgID int, year, month int) {
 	user, err := h.getOrCreateUser(chatID)
@@ -193,6 +254,13 @@ func (h *Handler) editCalendar(ctx context.Context, chatID int64, msgID int, yea
 
 	kbRows := [][]models.InlineKeyboardButton{}
 
+	// Year navigation row
+	kbRows = append(kbRows, []models.InlineKeyboardButton{
+		{Text: fmt.Sprintf("< %d", year-1), CallbackData: fmt.Sprintf("cal_prev_year_%d_%d", year-1, month)},
+		{Text: fmt.Sprintf("%d", year), CallbackData: fmt.Sprintf("cal_show_years_%d_%d", year, month)},
+		{Text: fmt.Sprintf("%d >", year+1), CallbackData: fmt.Sprintf("cal_next_year_%d_%d", year+1, month)},
+	})
+
 	// Weekday header row
 	headerRow := []models.InlineKeyboardButton{}
 	for _, wn := range cm.weekDays {
@@ -241,6 +309,17 @@ func (h *Handler) editCalendar(ctx context.Context, chatID int64, msgID int, yea
 	h.sendOrEdit(ctx, chatID, msgID, text, &kb)
 }
 
+// editCalendarYearPicker shows a 12-year grid for year selection.
+// refY/refM encode the view to return to via the Back button.
+func (h *Handler) editCalendarYearPicker(ctx context.Context, chatID int64, msgID int, centerYear, refM, refY int) {
+	backData := fmt.Sprintf("cal_years_back_%d_%d", refY, refM)
+	navSuffix := fmt.Sprintf("_%d_%d", refY, refM)
+	kb := buildYearPicker("cal_", backData, navSuffix, centerYear)
+	h.Bot.EditMessageText(ctx, &bot.EditMessageTextParams{
+		ChatID: chatID, MessageID: msgID, Text: "Select year:", ReplyMarkup: &kb,
+	})
+}
+
 // editDayView opens an existing message as a day view.
 func (h *Handler) editDayView(ctx context.Context, chatID int64, msgID int, user *db.User, date string, loc *time.Location) {
 	h.sendDayView(ctx, chatID, msgID, user, date, loc, false)