Make reactions harder to trigger from the keyboard

### Your use case

#### What would you like to do?

Make it harder for users to accidentally send a reaction via key press

#### Why would you like to do it?

This is problematic because heavy keyboard shortcut users also use number keys to do things like switch tabs, resulting accidental presses.

#### How would you like to achieve it?

One option might be to just pop up a reaction picker on key press, a bit similar to EW's reaction selection system. We could a Ctrl+K-style finder interface for them to quickly then send the right reaction through key press. E.g. Ctrl+? -> "+1" to send a 👍 .

### Have you considered any alternatives?

Adding a modifier key to the number combo could also work, but doesn't help another bug; the reaction number system only lets you send a set number of reactions from key press.

### Additional context

_No response_