Enhances visual feedback during drag-and-drop with dashed outline and transition effects. (RooCodeInc#3184)

* Add drag-and-drop functionality to ChatTextArea component

- Introduced state management for drag feedback with `isDraggingOver`.
- Implemented drag event handlers: `handleDragEnter`, `handleDragLeave`, and updated `onDragOver`.
- Enhanced visual feedback during drag-and-drop with dashed outline and transition effects.
- Reset drag state on drop event.

* New Ast salvage

* shift to drag

* shift to drag

* shift to drag

* shift to drag

* shift to drag

* shift to drag

* quote

* quote

* 500ms -> 100ms

* updated language and 250ms delay sweetspot

* better transitions

---------

Co-authored-by: Cline Evaluation <[email protected]>

Author: arafatkatze

.changeset/fair-papayas-learn.md

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+---
+"claude-dev": patch
+---
+
+Minor UX improvement to drag and drop ux