Allow editing the units count in the added stack in "Battle Only" mode

[EugeneSasin]

Preliminary checks

• I've checked that there aren't other open issues on the same topic.

Describe the problem requiring a solution

I suggest adding the ability to edit the number of units in "Battle Only" mode. Currently, changing the number of units requires removing and re-adding the stack

Describe the possible solution

When adding units, you can set their count (screen 1). I suggest using the same interface by clicking the units count area (screen 2)

Additional info

No response

[ihhub]

I agree with this idea. Having right-click for removing an army is not an ideal UX solution.