Stop message bubbles from stealing dropped files

Each bubble's UITextView keeps `isSelectable = true` so links remain
tappable, which also makes it a valid drop target — items dragged onto a
bubble landed on the text view instead of bubbling up to the timeline's
`.onDrop`. Disable `textDropInteraction` alongside the existing
`textDragInteraction` workaround.

ElementX/Sources/Other/Pills/MessageText.swift

@@ -173,6 +173,11 @@ struct MessageText: UIViewRepresentable {
         
         // Otherwise links can be dragged and dropped when long pressed
         textView.textDragInteraction?.isEnabled = false
+        // Otherwise items dropped onto a bubble land on the text view instead of
+        // bubbling up to the timeline's drop handler.
+        if let textDropInteraction = textView.textDropInteraction {
+            textView.removeInteraction(textDropInteraction)
+        }
         
         textView.contentInset = .zero
         textView.contentInsetAdjustmentBehavior = .never