I'm really surprised which nice design this virtual keyboard has!
It comes straight from Qwen3-Coder-480B-A35B-Instruct!! :-o
... I will integrate it into my design, l8rs.
The current code is changed and extended by me and myself.
...
Update [2025-08-28]: I've just integrated many nice extensions ...and I hope there are 'no'(...) bugs left..