Multiple issues with mouseinterval(0)

Since ncurses-6.6-20260301 many apps that internally use
`mouseinterval(0)`, appear to crash completely after just a few clicks
<https://github.com/termux/termux-packages/issues/29173#issuecomment-4166513572>
(see
also this
<https://github.com/termux/termux-packages/pull/28885#issuecomment-4172842288>
).

Separately, testing
<https://github.com/termux/termux-packages/pull/28885#issuecomment-4166455716>
 `mouseinterval(0)` *(script included below)* showcases that just two
consecutive extremely-rapid clicks are enough to disrupt overall mouse
button event handling from that point and on *(issue persists afterwards no
matter what)*.

```
    from pynput.mouse import Button, Controller

    # pip install pynput
    mouse = Controller()

    for i in range(0,2):
       mouse.press(Button.left)
       mouse.release(Button.left)
```

*(Plus, rapidly spamming multiple mouse buttons together, also appears to
trigger similar issues.)*

In practice, the 2nd issue rarely appears, since mouse clicks almost never
occur with literally zero delay. *However*, one environment where it does
actually appear is under Termux <https://github.com/termux/termux-app>,
where touch-taps\clicks are implemented with no delay between press and
release (see the reason why, here
<https://github.com/termux/termux-packages/pull/28885#issuecomment-4043796360>).
There, the issue unfolds in a more wild way due to the fact that touch\taps
are not the same as mouse clicks
<https://github.com/termux/termux-packages/pull/28885#issuecomment-4166481220>.
See also issue: https://github.com/termux/termux-packages/issues/28372

PS. I hope I haven't forgotten anything... let me know if you need any
further clarification or info. Hope this finds you well. Stay positive &
keep up the great work. I love Ncurses.