Wires the scene-list operations users asked for into the existing timeline
(model-agnostic — works for any scene, layer- or block-based):
- SceneThumbnailBlock: now sortable (@dnd-kit useSortable) with a left-edge grip
handle (listeners only on the handle so select/rename/resize still work); adds a
numeric per-scene duration input (commit on blur/Enter, clamped 1–30s) next to
the drag-resize; a `locked` prop makes it read-only.
- SceneThumbnailStrip: wraps the blocks in DndContext + SortableContext
(horizontal, 6px pointer-activation so clicks/resize aren't hijacked) and calls
the existing reorderScenes store action; gates add/browse + reorder/duplicate/
delete/duration behind isFixedSceneMode(chooseMode).
- studio-store: isFixedSceneMode() helper (single source for FIX vs FLEXIBLE).
- i18n: reorderScene / durationLabel / secondsUnit in fa + en.
Verified with `npm run build` (rules-of-hooks clean). NOTE: a THEME PICKER and
FlexStory block-FIELD editing are deferred — the studio editor is Konva-layer-
centric, so both need a FlexStory-aware editing path (a follow-up), not this phase.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
soroush.asadi
8ddca5647b