Add Split radial menu into separate attack and build buttons (#1598)

## Description:

This PR implements a new radial menu system that separates attack and
construction functionalities into distinct buttons. Previously, all
units (both attack and construction) were grouped together in a single
orange button, making the interface confusing and inefficient.

## 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
- [x] I have read and accepted the CLA agreement (only required once).

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

Kipstzz

<img width="420" height="345" alt="image"
src="https://github.com/user-attachments/assets/73d67fe1-d5d2-4c7e-8894-360877fa7004"
/>
<img width="422" height="345" alt="image"
src="https://github.com/user-attachments/assets/e576d543-4156-48f4-81ac-e7a06d26b25b"
/>

resources/lang/en.json

@@ -70,6 +70,7 @@
     "radial_title": "Radial menu",
     "radial_desc": "Right clicking (or touch on mobile) opens the Radial menu. Right click outside it to close it. From the menu you can:",
     "radial_build": "Open the Build menu.",
+    "radial_attack": "Open the Attack menu.",
     "radial_info": "Open the Info menu.",
     "radial_boat": "Send a Boat (transport ship) to attack at the selected location. Only available if you have access to water.",
     "radial_close": "Close the menu.",