Builder: Dragging new blocks from sidebar doesn't work on Android touch devices

[MenoXG]

Typebot version

3.17.2 (self-hosted, Docker)

Environment

• Device: Redmi Pad Pro 5G
• Android: HyperOS
• Browser: Chrome
• Also tested with Kiwi Browser
• Desktop mode enabled

Expected behavior

I should be able to drag a block from the left sidebar into the canvas using touch.

Actual behavior

Nothing happens.
The drag operation never starts.

Additional observations

• Existing blocks already placed on the canvas CAN be moved using touch.
• Panning and zooming the graph work correctly.
• Only dragging NEW blocks from the sidebar fails.
• I also noticed that Graph Gestures only provides "Mouse" and "Trackpad" modes.

Could you please confirm whether the Builder is officially expected to support touch-only devices (Android tablets / iPad), or if this is a bug?

If needed, I can provide a screen recording.

[MenoXG]

Hi! I investigated the issue a bit further and wanted to share my findings.
Issue: On Android (Chrome and Kiwi), I can't drag new blocks from the left sidebar into the graph. Existing blocks inside the graph work normally.
Interestingly, the exact same device/browser can drag and drop blocks correctly in SendPulse's flow editor.
After checking the source code, I noticed that the sidebar drag initialization is still based on mouse events:
BlockCardLayout.tsx
<button
...
onMouseDown={handleMouseDown}
/>
which eventually calls:
initBlockDragging(...)
and the drag lifecycle is handled with:
useEventListener("mousemove", handleMouseMove);
useEventListener("mouseup", handleMouseUp);
However, elsewhere in the builder there are already many places using Pointer Events:
pointerdown
onPointerDown
onPointerDownCapture
For example:
BlockSourceEndpoint
EventSourceEndpoint
Tooltip
ElementsSelectionMenu
etc.
This makes me wonder if the sidebar drag implementation simply hasn't been migrated to Pointer Events yet.
Do you think this could explain why dragging works with a mouse on desktop but not when starting a drag from the sidebar on Android touch devices?
I'm happy to test any patch if needed.
Thanks!