Confirm alliance break ⚠️ (#3033)

## Description:

People accidentally clicked the betray button because it's at the same
position as the ally button.
So let's add a small confirmation step.


https://github.com/user-attachments/assets/754f2d33-7419-42fc-a732-197c3107236e

## Please complete the following:

- [X] I have added screenshots for all UI updates
- [X] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [X] I have added relevant tests to the test directory
- [X] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

FloPinguin

resources/images/CheckmarkIconWhite.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
+  <path fill="#fff" d="M90.9 17.1c-3.9-3.9-10.2-3.9-14.1 0L37.5 56.4 23.2 42.1c-3.9-3.9-10.2-3.9-14.1 0s-3.9 10.2 0 14.1l21.4 21.4c1.9 1.9 4.4 2.9 7.1 2.9s5.1-1 7.1-2.9l46.4-46.4c3.8-3.9 3.8-10.2-.2-14.1z"/>
+</svg>