Replace 697 lines of inline drag/drop/resize/create/keyboard handlers
in WeekView.svelte with existing composables:
- useEventDragDrop: event drag & resize (was ~220 LOC inline)
- useTaskDragDrop: task drag & resize (was ~180 LOC inline)
- useSidebarDrop: sidebar task drop (was ~70 LOC inline)
- useDragToCreate: new composable for click-drag event creation (was ~105 LOC)
- useCalendarKeyboard: Escape key cancel (was ~50 LOC inline)
Also adds getResizePreviewTime() to useEventDragDrop return value
so WeekView doesn't need access to internal resize state.
WeekView.svelte: 1600 → 903 lines (-44%)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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