feat: extract into remaining packages

There has been a cyclic dependency.
transaction
	-> treasure_chest
	-> transaction_recurring
	-> transaction

This has been temporarily solved by moving the GenerateTransactions
function into the transaction package. In the future, this function has
to be rewritten to use a proper Service insteas of direct DB access or
replaced with a different system entirely.

internal/transaction_recurring/handler.go

@@ -4,7 +4,6 @@ import (
 	"net/http"
 	"spend-sparrow/internal/auth_types"
 	"spend-sparrow/internal/core"
-	"spend-sparrow/internal/utils"
 )
 
 type Handler interface {
@@ -35,7 +34,7 @@ func (h HandlerImpl) handleTransactionRecurringItemComp() http.HandlerFunc {
 
 		user := core.GetUser(r)
 		if user == nil {
-			utils.DoRedirect(w, r, "/auth/signin")
+			core.DoRedirect(w, r, "/auth/signin")
 			return
 		}
 
@@ -52,7 +51,7 @@ func (h HandlerImpl) handleUpdateTransactionRecurring() http.HandlerFunc {
 
 		user := core.GetUser(r)
 		if user == nil {
-			utils.DoRedirect(w, r, "/auth/signin")
+			core.DoRedirect(w, r, "/auth/signin")
 			return
 		}
 
@@ -91,7 +90,7 @@ func (h HandlerImpl) handleDeleteTransactionRecurring() http.HandlerFunc {
 
 		user := core.GetUser(r)
 		if user == nil {
-			utils.DoRedirect(w, r, "/auth/signin")
+			core.DoRedirect(w, r, "/auth/signin")
 			return
 		}
 
@@ -113,7 +112,7 @@ func (h HandlerImpl) renderItems(w http.ResponseWriter, r *http.Request, user *a
 	var transactionsRecurring []*TransactionRecurring
 	var err error
 	if accountId == "" && treasureChestId == "" {
-		utils.TriggerToastWithStatus(r.Context(), w, r, "error", "Please select an account or treasure chest", http.StatusBadRequest)
+		core.TriggerToastWithStatus(r.Context(), w, r, "error", "Please select an account or treasure chest", http.StatusBadRequest)
 	}
 	if accountId != "" {
 		transactionsRecurring, err = h.s.GetAllByAccount(r.Context(), user, accountId)