Fix DVD authoring SCR errors and queue animation persistence

DVD Authoring Fix:
- Add remultiplex step after MPEG encoding for DVD compliance
- Use ffmpeg -fflags +genpts -c copy -f dvd to fix timestamps
- Resolves "ERR: SCR moves backwards" error from dvdauthor
- FFmpeg direct encoding doesn't always create DVD-compliant streams
- Remux regenerates presentation timestamps correctly

Queue Animation Fix:
- Stop stripe animation on completed jobs
- Bug: Refresh() was always incrementing offset regardless of state
- Now only increments offset when animStop != nil (animation running)
- Completed/failed/cancelled jobs no longer show animated stripes

Testing:
- DVD authoring should now succeed on AVI files
- Completed queue jobs should show static progress bar

author_module.go

@@ -1615,7 +1615,28 @@ func (s *appState) runAuthoringPipeline(ctx context.Context, paths []string, reg
 		if err := runCommandWithLogger(ctx, platformConfig.FFmpegPath, args, logFn); err != nil {
 			return err
 		}
-		mpgPaths = append(mpgPaths, outPath)
+
+		// Remultiplex the MPEG to fix timestamps for DVD compliance
+		// This resolves "SCR moves backwards" errors from dvdauthor
+		remuxPath := filepath.Join(workDir, fmt.Sprintf("title_%02d_remux.mpg", i+1))
+		remuxArgs := []string{
+			"-fflags", "+genpts",
+			"-i", outPath,
+			"-c", "copy",
+			"-f", "dvd",
+			"-y",
+			remuxPath,
+		}
+		if logFn != nil {
+			logFn(fmt.Sprintf(">> ffmpeg %s (remuxing for DVD compliance)", strings.Join(remuxArgs, " ")))
+		}
+		if err := runCommandWithLogger(ctx, platformConfig.FFmpegPath, remuxArgs, logFn); err != nil {
+			return fmt.Errorf("remux failed: %w", err)
+		}
+
+		// Remove original encode, use remuxed version
+		os.Remove(outPath)
+		mpgPaths = append(mpgPaths, remuxPath)
 		advance("")
 	}
 

internal/ui/queueview.go

@@ -171,8 +171,14 @@ func (r *stripedProgressRenderer) MinSize() fyne.Size {
 }
 
 func (r *stripedProgressRenderer) Refresh() {
-	// small drift to animate stripes
+	// Only animate stripes when animation is active
-	r.bar.offset += 2
+	r.bar.animMu.Lock()
+	shouldAnimate := r.bar.animStop != nil
+	r.bar.animMu.Unlock()
+
+	if shouldAnimate {
+		r.bar.offset += 2
+	}
 	r.Layout(r.bg.Size())
 	canvas.Refresh(r.bg)
 	canvas.Refresh(r.stripes)