feat(author): Extract and display chapters from VIDEO_TS folders

Added chapter extraction from VIDEO_TS folders when importing:
- New extractChaptersFromVideoTS() function to parse chapters from VOB files
- Automatically loads chapters when VIDEO_TS folder is dropped
- Displays chapters in Chapters tab with "VIDEO_TS Chapters" source label
- Uses ffprobe to extract chapter info from main title VOB file

Chapters are now fully imported and visible in the UI when loading
VIDEO_TS folders, preserving the original DVD chapter structure.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

author_module.go

@@ -406,6 +406,8 @@ func buildChaptersTab(state *appState) fyne.CanvasObject {
 			sourceLabel.SetText("Source: Embedded chapters")
 		case "scenes":
 			sourceLabel.SetText("Source: Scene detection")
+		case "videots":
+			sourceLabel.SetText("Source: VIDEO_TS chapters")
 		default:
 			sourceLabel.SetText("Source: Chapters")
 		}
@@ -981,6 +983,8 @@ func (s *appState) authorChapterSummary() (int, string) {
 			return len(s.authorChapters), "Embedded Chapters"
 		case "scenes":
 			return len(s.authorChapters), "Scene Chapters"
+		case "videots":
+			return len(s.authorChapters), "VIDEO_TS Chapters"
 		default:
 			return len(s.authorChapters), "Chapters"
 		}
@@ -1076,6 +1080,28 @@ func (s *appState) loadEmbeddedChapters(path string) {
 	}
 }
 
+func (s *appState) loadVideoTSChapters(videoTSPath string) {
+	chapters, err := extractChaptersFromVideoTS(videoTSPath)
+	if err != nil || len(chapters) == 0 {
+		// No chapters found, clear if previously set
+		if s.authorChapterSource == "videots" {
+			s.authorChapters = nil
+			s.authorChapterSource = ""
+			s.updateAuthorSummary()
+			if s.authorChaptersRefresh != nil {
+				s.authorChaptersRefresh()
+			}
+		}
+		return
+	}
+	s.authorChapters = chapters
+	s.authorChapterSource = "videots"
+	s.updateAuthorSummary()
+	if s.authorChaptersRefresh != nil {
+		s.authorChaptersRefresh()
+	}
+}
+
 func chaptersFromClips(clips []authorClip) []authorChapter {
 	if len(clips) == 0 {
 		return nil
@@ -1222,6 +1248,27 @@ func extractChaptersFromFile(path string) ([]authorChapter, error) {
 	return chapters, nil
 }
 
+func extractChaptersFromVideoTS(videoTSPath string) ([]authorChapter, error) {
+	// Try to find the main title VOB files
+	// Usually VTS_01_1.VOB contains the main content
+	vobFiles, err := filepath.Glob(filepath.Join(videoTSPath, "VTS_*_1.VOB"))
+	if err != nil || len(vobFiles) == 0 {
+		return nil, fmt.Errorf("no VOB files found in VIDEO_TS")
+	}
+
+	// Sort to get the first title set (usually the main feature)
+	sort.Strings(vobFiles)
+	mainVOB := vobFiles[0]
+
+	// Try to extract chapters from the main VOB using ffprobe
+	chapters, err := extractChaptersFromFile(mainVOB)
+	if err != nil {
+		return nil, err
+	}
+
+	return chapters, nil
+}
+
 func chaptersToDVDAuthor(chapters []authorChapter) string {
 	if len(chapters) == 0 {
 		return ""

main.go

@@ -10483,6 +10483,7 @@ func (s *appState) handleDrop(pos fyne.Position, items []fyne.URI) {
 			s.authorClips = nil
 			s.authorFile = nil
 			s.authorOutputType = "iso"
+			s.loadVideoTSChapters(videoTSPath)
 			s.showAuthorView()
 			return
 		}