Add refresh from source for entries and whole lists

- Every provider can look an entry up again by its ID (TMDB, TheTVDB,
  IGDB, Deezer, MusicBrainz, Wikipedia); search and lookup share parsing
- POST /api/items/{id}/refresh re-applies title, subtitle, year,
  description, link, details and artwork. Kept: the "why" note, rank,
  theater production/venue/cast and a theater entry's year, the Deezer
  preview match. Empty source fields don't erase existing values
- New items.image_custom column (migration 4; existing uploads marked)
  records artwork the owner chose; refresh keeps it unless asked
- Refused for custom lists and hand-added entries; entries the source
  dropped are reported, and a refresh whose title shares no words with
  the current one is rejected as a likely bad ID
- Editor: refresh button per row (asks about the owner's own artwork),
  and "Refresh all" with a confirm step, replace-my-art checkbox,
  progress with Stop, and a summary of problems

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

internal/store/items.go

@@ -17,6 +17,7 @@ type Item struct {
 	Year        string            `json:"year"`
 	Image       string            `json:"image"`       // cached file name under /images/
 	ImageSource string            `json:"imageSource"` // where the image came from
+	CustomArt   bool              `json:"customArt"`   // chosen by the owner, not the source
 	Provider    string            `json:"provider"`
 	ProviderID  string            `json:"providerId"`
 	ExternalURL string            `json:"externalUrl"`
@@ -25,12 +26,12 @@ type Item struct {
 	Extra       map[string]string `json:"extra"`
 }
 
-const itemColumns = `id, list_id, rank, title, subtitle, year, image, image_source, provider, provider_id, external_url, description, note, extra`
+const itemColumns = `id, list_id, rank, title, subtitle, year, image, image_source, image_custom, provider, provider_id, external_url, description, note, extra`
 
 func scanItem(row interface{ Scan(...any) error }) (Item, error) {
 	var it Item
 	var extra string
-	err := row.Scan(&it.ID, &it.ListID, &it.Rank, &it.Title, &it.Subtitle, &it.Year, &it.Image, &it.ImageSource,
+	err := row.Scan(&it.ID, &it.ListID, &it.Rank, &it.Title, &it.Subtitle, &it.Year, &it.Image, &it.ImageSource, &it.CustomArt,
 		&it.Provider, &it.ProviderID, &it.ExternalURL, &it.Description, &it.Note, &extra)
 	if errors.Is(err, sql.ErrNoRows) {
 		return it, ErrNotFound
@@ -138,9 +139,9 @@ func (s *Store) AddItem(ctx context.Context, it Item, rank int) (Item, error) {
 	if _, err := tx.ExecContext(ctx, `UPDATE items SET rank = rank + 1 WHERE list_id = ? AND rank >= ?`, it.ListID, rank); err != nil {
 		return it, err
 	}
-	res, err := tx.ExecContext(ctx, `INSERT INTO items (list_id, rank, title, subtitle, year, image, image_source, provider, provider_id, external_url, description, note, extra)
-		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
-		it.ListID, rank, it.Title, it.Subtitle, it.Year, it.Image, it.ImageSource, it.Provider, it.ProviderID, it.ExternalURL, it.Description, it.Note, extraJSON(it.Extra))
+	res, err := tx.ExecContext(ctx, `INSERT INTO items (list_id, rank, title, subtitle, year, image, image_source, image_custom, provider, provider_id, external_url, description, note, extra)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+		it.ListID, rank, it.Title, it.Subtitle, it.Year, it.Image, it.ImageSource, it.CustomArt, it.Provider, it.ProviderID, it.ExternalURL, it.Description, it.Note, extraJSON(it.Extra))
 	if err != nil {
 		return it, err
 	}
@@ -159,8 +160,8 @@ func (s *Store) UpdateItem(ctx context.Context, it Item) (Item, error) {
 	if err := it.normalize(); err != nil {
 		return it, err
 	}
-	res, err := s.db.ExecContext(ctx, `UPDATE items SET title=?, subtitle=?, year=?, image=?, image_source=?, external_url=?, description=?, note=?, extra=?, updated_at=unixepoch() WHERE id=?`,
-		it.Title, it.Subtitle, it.Year, it.Image, it.ImageSource, it.ExternalURL, it.Description, it.Note, extraJSON(it.Extra), it.ID)
+	res, err := s.db.ExecContext(ctx, `UPDATE items SET title=?, subtitle=?, year=?, image=?, image_source=?, image_custom=?, external_url=?, description=?, note=?, extra=?, updated_at=unixepoch() WHERE id=?`,
+		it.Title, it.Subtitle, it.Year, it.Image, it.ImageSource, it.CustomArt, it.ExternalURL, it.Description, it.Note, extraJSON(it.Extra), it.ID)
 	if err != nil {
 		return it, err
 	}

internal/store/store.go

@@ -113,6 +113,10 @@ CREATE INDEX items_list_rank ON items(list_id, rank);
 	`ALTER TABLE lists ADD COLUMN art TEXT NOT NULL DEFAULT '';`,
 	// The source's description of the item (TMDB overview, IGDB summary…).
 	`ALTER TABLE items ADD COLUMN description TEXT NOT NULL DEFAULT '';`,
+	// Whether the owner chose the artwork (upload, pasted URL, or removed it)
+	// rather than taking the source's; refresh leaves it alone unless asked.
+	`ALTER TABLE items ADD COLUMN image_custom INTEGER NOT NULL DEFAULT 0;
+UPDATE items SET image_custom = 1 WHERE image_source = 'upload';`,
 }
 
 func (s *Store) migrate(ctx context.Context) error {