[stultus]

Summary

Fixes two bugs in scene drag-reorder.

1. Drag broken when numbering doesn't start at 1. The scene navigator and the cards view started a drag using the displayed scene number, which is offset by scene_number_start. Drop detection and reorderScene count scenes by position, starting at 1. For a file whose numbering starts at, say, 41, the drag either did nothing or moved the wrong scene. Both views now use the position throughout. This affects co-writing files that are each assigned a scene range.

2. Navigator drag left scene card data behind. SceneNavigator.reorderScene didn't update scene_cards[].scene_index. A scene dragged in the sidebar ended up showing its old slot's description, shoot notes and schedule. It now applies the same update SceneCardsView.reorderScene already does.

Testing

• svelte-check: 0 errors, 0 warnings; eslint and prettier are clean.
• Not tested by hand in the app yet. Suggested check:
  1. Set Scene numbering starts at to 41.
  2. Add descriptions to a few scene cards.
  3. Drag a scene in the sidebar and in the cards view.
  4. Confirm the right scene moves and its description moves with it.

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