Add the step-by-step fixer and library types

Each pair is a Music (Artist/Album/01 Title) or Soundtracks (Album/01 Title)
library. The new Fixer tab takes the master, then the slave, through four
reviewed steps: folder structure, album tags (optional MusicBrainz lookup;
the slave reuses the fixed master's tags), folder names and file names,
then links the two libraries. Every fix is an undoable operation.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/store/models.go

@@ -154,6 +154,8 @@ type Pair struct {
 	AutoOrganize        string          `json:"auto_organize"`      // off, slave, master or both
 	OrganizeDiscDigits  int             `json:"-"`                  // superseded by OrganizeConfig; read to convert old settings
 	OrganizeConfig      json.RawMessage `json:"-"`                  // naming settings (engine.NamingConfig)
+	LibraryType         string          `json:"library_type"`       // music or soundtracks
+	FixerState          json.RawMessage `json:"-"`                  // step-by-step fixer progress (engine.FixerState)
 	LastScanAt          *int64          `json:"last_scan_at"`
 	LastScanError       string          `json:"last_scan_error"`
 	LastScanWarnings    []Warning       `json:"last_scan_warnings"`
@@ -163,18 +165,18 @@ type Pair struct {
 const pairCols = `id, name, master_root, slave_root, quarantine_dir, extensions, auto_link_identical,
 	scan_interval_minutes, retention_days, settle_minutes, approx_matching, approx_threshold, organize_template,
 	organize_multidisc, auto_organize, organize_disc_digits, organize_config, last_scan_at, last_scan_error,
-	last_scan_warnings, created_at`
+	last_scan_warnings, created_at, library_type, fixer_state`
 
 type scanner interface{ Scan(...any) error }
 
 func scanPair(r scanner) (Pair, error) {
 	var p Pair
-	var exts, warns, orgCfg string
+	var exts, warns, orgCfg, fixer string
 	var last sql.NullInt64
 	err := r.Scan(&p.ID, &p.Name, &p.MasterRoot, &p.SlaveRoot, &p.QuarantineDir, &exts, &p.AutoLinkIdentical,
 		&p.ScanIntervalMinutes, &p.RetentionDays, &p.SettleMinutes, &p.ApproxMatching, &p.ApproxThreshold, &p.OrganizeTemplate,
 		&p.OrganizeMultiDisc, &p.AutoOrganize, &p.OrganizeDiscDigits, &orgCfg, &last, &p.LastScanError,
-		&warns, &p.CreatedAt)
+		&warns, &p.CreatedAt, &p.LibraryType, &fixer)
 	if err != nil {
 		return p, err
 	}
@@ -186,6 +188,9 @@ func scanPair(r scanner) (Pair, error) {
 	if orgCfg != "" {
 		p.OrganizeConfig = json.RawMessage(orgCfg)
 	}
+	if fixer != "" {
+		p.FixerState = json.RawMessage(fixer)
+	}
 	return p, nil
 }
 
@@ -219,11 +224,11 @@ func (s *Store) SavePair(ctx context.Context, p *Pair) error {
 	if p.ID == 0 {
 		res, err := s.DB.ExecContext(ctx, `INSERT INTO pairs (name, master_root, slave_root, quarantine_dir, extensions,
 			auto_link_identical, scan_interval_minutes, retention_days, settle_minutes, approx_matching, approx_threshold,
-			organize_template, organize_multidisc, auto_organize, organize_disc_digits, organize_config, created_at)
-			VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+			organize_template, organize_multidisc, auto_organize, organize_disc_digits, organize_config, library_type, created_at)
+			VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
 			p.Name, p.MasterRoot, p.SlaveRoot, p.QuarantineDir, exts, p.AutoLinkIdentical,
 			p.ScanIntervalMinutes, p.RetentionDays, p.SettleMinutes, p.ApproxMatching, p.ApproxThreshold,
-			p.OrganizeTemplate, p.OrganizeMultiDisc, p.AutoOrganize, p.OrganizeDiscDigits, string(p.OrganizeConfig), now())
+			p.OrganizeTemplate, p.OrganizeMultiDisc, p.AutoOrganize, p.OrganizeDiscDigits, string(p.OrganizeConfig), p.LibraryType, now())
 		if err != nil {
 			return err
 		}
@@ -233,10 +238,16 @@ func (s *Store) SavePair(ctx context.Context, p *Pair) error {
 	_, err := s.DB.ExecContext(ctx, `UPDATE pairs SET name = ?, master_root = ?, slave_root = ?, quarantine_dir = ?,
 		extensions = ?, auto_link_identical = ?, scan_interval_minutes = ?, retention_days = ?, settle_minutes = ?,
 		approx_matching = ?, approx_threshold = ?, organize_template = ?, organize_multidisc = ?, auto_organize = ?,
-		organize_disc_digits = ?, organize_config = ? WHERE id = ?`,
+		organize_disc_digits = ?, organize_config = ?, library_type = ? WHERE id = ?`,
 		p.Name, p.MasterRoot, p.SlaveRoot, p.QuarantineDir, exts, p.AutoLinkIdentical,
 		p.ScanIntervalMinutes, p.RetentionDays, p.SettleMinutes, p.ApproxMatching, p.ApproxThreshold,
-		p.OrganizeTemplate, p.OrganizeMultiDisc, p.AutoOrganize, p.OrganizeDiscDigits, string(p.OrganizeConfig), p.ID)
+		p.OrganizeTemplate, p.OrganizeMultiDisc, p.AutoOrganize, p.OrganizeDiscDigits, string(p.OrganizeConfig), p.LibraryType, p.ID)
+	return err
+}
+
+// SetFixerState stores the fixer's progress for a pair.
+func (s *Store) SetFixerState(ctx context.Context, id int64, raw []byte) error {
+	_, err := s.DB.ExecContext(ctx, `UPDATE pairs SET fixer_state = ? WHERE id = ?`, string(raw), id)
 	return err
 }
 
@@ -664,14 +675,15 @@ type Operation struct {
 
 // Operation actions.
 const (
-	ActLink    = "link"    // slave replaced by hardlink of master
-	ActPromote = "promote" // master replaced by slave's file, then linked
-	ActBuild   = "build"   // master file linked into the slave (fresh library)
-	ActRemove  = "remove"  // slave hardlink removed (master copy kept)
-	ActRename  = "rename"  // slave folder renamed to the master's spelling
-	ActTags    = "tags"    // tags of a file edited
-	ActMove    = "move"    // file renamed/moved by the organizer
-	ActCover   = "cover"   // album folder image written
+	ActLink    = "link"     // slave replaced by hardlink of master
+	ActPromote = "promote"  // master replaced by slave's file, then linked
+	ActBuild   = "build"    // master file linked into the slave (fresh library)
+	ActRemove  = "remove"   // slave hardlink removed (master copy kept)
+	ActRename  = "rename"   // slave folder renamed to the master's spelling
+	ActTags    = "tags"     // tags of a file edited
+	ActMove    = "move"     // file renamed/moved by the organizer
+	ActCover   = "cover"    // album folder image written
+	ActMoveDir = "move-dir" // folder moved by the fixer (structure or folder names)
 )
 
 // Operation statuses.