refactor: migrate from go-telegram-bot-api/v5 to go-telegram/bot

- Replaced tgbotapi with go-telegram/bot (zero-dependency, context-aware, Bot API 10.0)
- All handler methods now accept context.Context; threading ctx through all sends/edits
- Changed from function-based (NewMessage/NewEditMessageText/NewInlineKeyboardMarkup) to struct-param API (SendMessageParams/EditMessageTextParams/InlineKeyboardMarkup)
- Added colored buttons: DEL buttons in calendar use Style: 'danger' (red)
- Both polling and webhook modes preserved with new library patterns
- Context-based shutdown (signal.NotifyContext) replaces stop channel

internal/bot/report.go

@@ -1,11 +1,13 @@
 package bot
 
 import (
+	"context"
 	"fmt"
 	"log/slog"
 	"time"
 
-	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
+	bot "github.com/go-telegram/bot"
+	"github.com/go-telegram/bot/models"
 
 	"worktimeBot/internal/db"
 )
@@ -54,13 +56,33 @@ func (h *Handler) buildStatusText(chatID int64) string {
 }
 
 // backToMenu returns to the main menu from any sub-menu.
-func (h *Handler) backToMenu(chatID int64, msgID int, callbackID string) {
-	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
+func (h *Handler) backToMenu(ctx context.Context, chatID int64, msgID int, callbackID string) {
+	defer h.Bot.AnswerCallbackQuery(ctx, &bot.AnswerCallbackQueryParams{CallbackQueryID: callbackID})
 	text := h.buildStatusText(chatID)
-	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
-	kb := mainKeyboard()
-	edit.ReplyMarkup = &kb
-	h.Bot.Send(edit)
+	h.Bot.EditMessageText(ctx, &bot.EditMessageTextParams{
+		ChatID:    chatID,
+		MessageID: msgID,
+		Text:      text,
+		ReplyMarkup: &models.InlineKeyboardMarkup{
+			InlineKeyboard: [][]models.InlineKeyboardButton{
+				{
+					{Text: "Clock In", CallbackData: "clockin"},
+					{Text: "Clock Out", CallbackData: "clockout"},
+				},
+				{
+					{Text: "Work Type", CallbackData: "worktype"},
+					{Text: "Day Off", CallbackData: "dayoff"},
+				},
+				{
+					{Text: "Report", CallbackData: "report"},
+					{Text: "Export", CallbackData: "export"},
+				},
+				{
+					{Text: "Settings", CallbackData: "settings"},
+				},
+			},
+		},
+	})
 }
 
 // buildDailyReport builds a formatted daily report string for a given user/day.
@@ -119,7 +141,7 @@ func (h *Handler) buildDailyReport(user *db.User, day *db.Day, events []db.Event
 }
 
 // SendDailyReport sends the automated daily report to the user.
-func (h *Handler) SendDailyReport(userID int64, chatID int64) {
+func (h *Handler) SendDailyReport(ctx context.Context, userID int64, chatID int64) {
 	user, err := h.DB.GetUserByChatID(chatID)
 	if err != nil {
 		slog.Error("daily report: user not found", "user_id", userID)
@@ -143,7 +165,6 @@ func (h *Handler) SendDailyReport(userID int64, chatID int64) {
 		return
 	}
 	text := h.buildDailyReport(user, day, events)
-	reply := tgbotapi.NewMessage(chatID, text)
-	h.Bot.Send(reply)
+	h.Bot.SendMessage(ctx, &bot.SendMessageParams{ChatID: chatID, Text: text})
 	h.DB.MarkReportSent(user.ID, today)
 }