Add layout system and file selection logic

Introduce a new layout system for managing main window content and tabs. Integrate file selection and drag-and-drop functionality for adding files to the conversion list, with automatic tab switching to "Added Files". Refactor existing components to support these features.

internal/application/convertor/items_to_convert.go

@@ -10,7 +10,7 @@ import (
 )
 
 type ItemsToConvertContract interface {
-	Add(file *File)
+	Add(file *ffmpeg.File)
 	Clear()
 	GetItems() map[int]ItemToConvertContract
 	GetItemsContainer() *fyne.Container
@@ -41,7 +41,7 @@ func (items *itemsToConvert) GetItemsContainer() *fyne.Container {
 	return items.itemsContainer
 }
 
-func (items *itemsToConvert) Add(file *File) {
+func (items *itemsToConvert) Add(file *ffmpeg.File) {
 	nextId := items.nextId
 	var content *fyne.Container
 	var buttonPlay *widget.Button
@@ -49,9 +49,15 @@ func (items *itemsToConvert) Add(file *File) {
 	buttonPlay = widget.NewButtonWithIcon("", theme.Icon(theme.IconNameMediaPlay), func() {
 		buttonPlay.Disable()
 		go func() {
-			//_ = items.ffplayService.Run(FFplaySetting{
-			//	PathToFile: file.Path,
-			//})
+			ffplay, err := items.ffmpeg.GetFFplay()
+			if err != nil {
+				fyne.Do(func() {
+					buttonPlay.Enable()
+				})
+				return
+			}
+
+			_ = ffplay.Play(file)
 			fyne.Do(func() {
 				buttonPlay.Enable()
 			})
@@ -108,23 +114,23 @@ func (items *itemsToConvert) Clear() {
 }
 
 type ItemToConvertContract interface {
-	GetFile() *File
+	GetFile() *ffmpeg.File
 	GetContent() *fyne.Container
 }
 
 type itemToConvert struct {
-	file    *File
+	file    *ffmpeg.File
 	content *fyne.Container
 }
 
-func newItemToConvert(file *File, content *fyne.Container) ItemToConvertContract {
+func newItemToConvert(file *ffmpeg.File, content *fyne.Container) ItemToConvertContract {
 	return &itemToConvert{
 		file:    file,
 		content: content,
 	}
 }
 
-func (item *itemToConvert) GetFile() *File {
+func (item *itemToConvert) GetFile() *ffmpeg.File {
 	return item.file
 }