fix: remove shift key requirement for image drag-and-drop

Fixes #6953 - Users can now drag and drop images into the prompt field
without holding the Shift key. This restores the expected behavior where
drag-and-drop works naturally for image files.

webview-ui/src/components/chat/ChatTextArea.tsx

@@ -1175,12 +1175,6 @@ const ChatTextArea = forwardRef<HTMLTextAreaElement, ChatTextAreaProps>(
 						className={cn("chat-text-area", "relative", "flex", "flex-col", "outline-none")}
 						onDrop={handleDrop}
 						onDragOver={(e) => {
-							// Only allowed to drop images/files on shift key pressed.
-							if (!e.shiftKey) {
-								setIsDraggingOver(false)
-								return
-							}
-
 							e.preventDefault()
 							setIsDraggingOver(true)
 							e.dataTransfer.dropEffect = "copy"