Introduce progress bar updates and queue processing logic

Implemented progress bar integration with `ProgressBarContract` for real-time conversion tracking and status updates. Added queue management functionality to process files sequentially with error and completion handling. Extended `ConvertorContract` and `FFmpegContract` to support tracking of running processes and conversion progress.

internal/application/app.go

@@ -5,6 +5,7 @@ import (
 	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/internal/application/convertor"
 	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/internal/application/setting"
 	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/internal/ffmpeg"
+	"time"
 )
 
 type AppContract interface {
@@ -16,6 +17,8 @@ type AppContract interface {
 	GetItemsToConvert() convertor.ItemsToConvertContract
 	GetQueueService() convertor.QueueListContract
 	Run()
+	AfterClosing()
+	RunConvertor()
 }
 
 type application struct {
@@ -79,3 +82,56 @@ func (a *application) GetConvertorService() convertor.ConvertorContract {
 func (a *application) Run() {
 	a.fyneApp.Run()
 }
+
+func (a *application) RunConvertor() {
+	go func() {
+		for {
+			time.Sleep(time.Millisecond * 3000)
+			queueId, queue := a.queueService.Next()
+			if queue == nil {
+				continue
+			}
+
+			queue.Status = convertor.StatusType(convertor.InProgress)
+			a.queueService.EventChangeQueue(queueId, queue)
+
+			if a.progressBarService.GetContainer().Hidden {
+				a.progressBarService.GetContainer().Show()
+			}
+
+			totalDuration := float64(0)
+			ffprobe, err := a.ffmpegService.GetFFprobe()
+			if err == nil {
+				totalDuration, err = ffprobe.GetTotalDuration(&queue.Setting.FileInput)
+				if err != nil {
+					totalDuration = float64(0)
+				}
+			}
+
+			progress := a.progressBarService.GetProgressbar(
+				totalDuration,
+				queue.Setting.FileInput.Path,
+			)
+
+			err = a.convertorService.RunConvert(*queue.Setting, progress)
+			if err != nil {
+				queue.Status = convertor.StatusType(convertor.Error)
+				queue.Error = err
+				a.queueService.EventChangeQueue(queueId, queue)
+				a.progressBarService.ProcessEndedWithError(err.Error())
+
+				continue
+			}
+
+			queue.Status = convertor.StatusType(convertor.Completed)
+			a.queueService.EventChangeQueue(queueId, queue)
+			a.progressBarService.ProcessEndedWithSuccess(&queue.Setting.FileOut)
+		}
+	}()
+}
+
+func (a *application) AfterClosing() {
+	for _, cmd := range a.convertorService.GetRunningProcesses() {
+		_ = cmd.Process.Kill()
+	}
+}