Phase 2B: Add Copy Command button to queue view for running/pending jobs

Added "Copy Command" button to queue view for running and pending jobs,
allowing users to copy the FFmpeg command to clipboard for manual execution.

Changes:
- internal/ui/queueview.go: Add onCopyCommand parameter and buttons
- main.go: Implement onCopyCommand handler in showQueue()

The handler retrieves the job, generates the FFmpeg command with
INPUT/OUTPUT placeholders using buildFFmpegCommandFromJob(), and copies
it to the clipboard with a confirmation dialog.

🤖 Generated with Claude Code

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

internal/ui/queueview.go

@@ -138,6 +138,7 @@ func BuildQueueView(
 	onClearAll func(),
 	onCopyError func(string),
 	onViewLog func(string),
+	onCopyCommand func(string),
 	titleColor, bgColor, textColor color.Color,
 ) (fyne.CanvasObject, *container.Scroll) {
 	// Header
@@ -181,7 +182,7 @@ func BuildQueueView(
 		jobItems = append(jobItems, container.NewCenter(emptyMsg))
 	} else {
 		for _, job := range jobs {
-			jobItems = append(jobItems, buildJobItem(job, onPause, onResume, onCancel, onRemove, onMoveUp, onMoveDown, onCopyError, onViewLog, bgColor, textColor))
+			jobItems = append(jobItems, buildJobItem(job, onPause, onResume, onCancel, onRemove, onMoveUp, onMoveDown, onCopyError, onViewLog, onCopyCommand, bgColor, textColor))
 		}
 	}
 
@@ -211,6 +212,7 @@ func buildJobItem(
 	onMoveDown func(string),
 	onCopyError func(string),
 	onViewLog func(string),
+	onCopyCommand func(string),
 	bgColor, textColor color.Color,
 ) fyne.CanvasObject {
 	// Status color
@@ -261,6 +263,7 @@ func buildJobItem(
 	switch job.Status {
 	case queue.JobStatusRunning:
 		buttons = append(buttons,
+			widget.NewButton("Copy Command", func() { onCopyCommand(job.ID) }),
 			widget.NewButton("Pause", func() { onPause(job.ID) }),
 			widget.NewButton("Cancel", func() { onCancel(job.ID) }),
 		)
@@ -271,6 +274,7 @@ func buildJobItem(
 		)
 	case queue.JobStatusPending:
 		buttons = append(buttons,
+			widget.NewButton("Copy Command", func() { onCopyCommand(job.ID) }),
 			widget.NewButton("Cancel", func() { onCancel(job.ID) }),
 		)
 	case queue.JobStatusCompleted, queue.JobStatusFailed, queue.JobStatusCancelled:

main.go

@@ -1340,6 +1340,20 @@ func (s *appState) refreshQueueView() {
 			text.Disable()
 			dialog.ShowCustom("Conversion Log", "Close", container.NewVScroll(text), s.window)
 		},
+		func(id string) { // onCopyCommand
+			job, err := s.jobQueue.Get(id)
+			if err != nil {
+				logging.Debug(logging.CatSystem, "copy command failed: %v", err)
+				return
+			}
+			cmdStr := buildFFmpegCommandFromJob(job)
+			if cmdStr == "" {
+				dialog.ShowInformation("No Command", "Unable to generate FFmpeg command for this job.", s.window)
+				return
+			}
+			s.window.Clipboard().SetContent(cmdStr)
+			dialog.ShowInformation("Copied", "FFmpeg command copied to clipboard", s.window)
+		},
 		utils.MustHex("#4CE870"), // titleColor
 		gridColor,                // bgColor
 		textColor,                // textColor