fix(ebooks): route targeted files through ebook scanner

internal/scanner/scanner.go

@@ -1981,6 +1981,12 @@ func (s *Scanner) ScanFile(ctx context.Context, filePath string, folder *models.
 		}
 		return s.syncFolderScopedAudioLibraryState(ctx, folder.ID)
 	}
+	if librarykind.IsEbook(folder.Type) {
+		if !SupportsEbookFile(cleanFile) {
+			return fmt.Errorf("unrecognized ebook extension: %s", strings.ToLower(filepath.Ext(cleanFile)))
+		}
+		return s.scanEbookPaths(ctx, folder, []string{cleanFile}, false)
+	}
 
 	// Verify the file extension is recognized.
 	ext := strings.ToLower(filepath.Ext(cleanFile))

internal/scanner/scanner_test.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 	"sort"
+	"strings"
 	"testing"
 	"time"
 
@@ -265,3 +266,21 @@ func TestScanSubtreeEbookLibraryRoutesToEbookScanner(t *testing.T) {
 		t.Fatal("ScanSubtree ebook result = nil, want empty result")
 	}
 }
+
+func TestScanFileEbookLibraryUsesEbookPipeline(t *testing.T) {
+	filePath := filepath.Join(t.TempDir(), "book.epub")
+	if err := os.WriteFile(filePath, []byte("not a real epub"), 0o644); err != nil {
+		t.Fatalf("write fake ebook: %v", err)
+	}
+
+	err := (&Scanner{}).ScanFile(context.Background(), filePath, &models.MediaFolder{ID: 44, Type: "ebooks"})
+	if err == nil {
+		t.Fatal("ScanFile returned nil, want ebook parse failure")
+	}
+	if strings.Contains(err.Error(), "unrecognized video extension") {
+		t.Fatalf("ScanFile used video extension gate: %v", err)
+	}
+	if !strings.Contains(err.Error(), "folder_id=44") {
+		t.Fatalf("error = %q, want ebook scanner aggregate failure", err)
+	}
+}