Add persistent storage for directory saving setting

Introduced `DirectoryForSaving` for managing directory paths persistently. Integrated the new setting into relevant modules, ensuring the selected directory is saved and loaded across sessions.

handler/convertor.go

@@ -7,6 +7,7 @@ import (
 	error2 "git.kor-elf.net/kor-elf/gui-for-ffmpeg/error"
 	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/helper"
 	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/kernel"
+	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/setting"
 	"github.com/nicksnyder/go-i18n/v2/i18n"
 )
 
@@ -18,10 +19,11 @@ type ConvertorHandlerContract interface {
 }
 
 type ConvertorHandler struct {
-	app                 kernel.AppContract
-	convertorView       convertor.ViewContract
-	errorView           error2.ViewContract
-	convertorRepository convertor.RepositoryContract
+	app                       kernel.AppContract
+	convertorView             convertor.ViewContract
+	errorView                 error2.ViewContract
+	convertorRepository       convertor.RepositoryContract
+	settingDirectoryForSaving setting.DirectoryForSavingContract
 }
 
 func NewConvertorHandler(
@@ -29,12 +31,14 @@ func NewConvertorHandler(
 	convertorView convertor.ViewContract,
 	errorView error2.ViewContract,
 	convertorRepository convertor.RepositoryContract,
+	settingDirectoryForSaving setting.DirectoryForSavingContract,
 ) *ConvertorHandler {
 	return &ConvertorHandler{
-		app:                 app,
-		convertorView:       convertorView,
-		errorView:           errorView,
-		convertorRepository: convertorRepository,
+		app:                       app,
+		convertorView:             convertorView,
+		errorView:                 errorView,
+		convertorRepository:       convertorRepository,
+		settingDirectoryForSaving: settingDirectoryForSaving,
 	}
 }
 
@@ -45,7 +49,7 @@ func (h ConvertorHandler) MainConvertor() {
 			h.errorView.PanicError(err)
 			return
 		}
-		conversion := view.NewConversion(h.app, formats, h.runConvert)
+		conversion := view.NewConversion(h.app, formats, h.runConvert, h.settingDirectoryForSaving)
 		h.convertorView.Main(conversion)
 		return
 	}