Follow-up to #163. Implements the second half: a submenu on the per-scene actions cluster that lists the series' other episodes. Selecting one cuts the scene's ProseMirror nodes + scene_card from the current episode and appends them to the chosen episode, recomputing scene_index on both. Pairs with #156's IDE-style explorer (drag-between-folders is the same data move surfaced differently).
Follow-up to #163. Implements the second half: a submenu on the per-scene actions cluster that lists the series' other episodes. Selecting one cuts the scene's ProseMirror nodes + scene_card from the current episode and appends them to the chosen episode, recomputing scene_index on both. Pairs with #156's IDE-style explorer (drag-between-folders is the same data move surfaced differently).