All callback handlers now use editOrSendCallback() to edit the existing
message in-place instead of bot.sendMessage() which creates new messages
and clutters the chat. If edit fails (message too old), the old message
is deleted and a new one sent.
Added src/utils/messageUtils.js with:
- editOrSendCallback(callbackQuery, text, options) — edit or fallback
- editOrSend(chatId, messageId, text, options) — edit or fallback
- deleteAndSend(chatId, messageId, text, options) — delete then send
Fixed handlers:
- userProductHandler: handleBuyProduct errors, handlePay validation/stock errors
- userPurchaseHandler: viewPurchase errors, handleConfirmReceived errors, handlePurchaseListPage errors
- userLocationHandler: all error paths now edit in-place
- userDeletionHandler: both error paths now edit in-place
- wallet/balanceHandler: showBalance error (text command, acceptable)
- wallet/refreshHandler: user not found and refresh errors
- wallet/topUpHandler: wallet loading error
- wallet/createHandler: invalid wallet type error
- wallet/historyHandler: both transaction history error paths
- wallet/archiveHandler: archived wallets error
