Random spawn (#2375)

## Description:

https://github.com/openfrontio/OpenFrontIO/issues/2352

This is my first PR in this project, and I’ll continue refining it based
on feedback.

<img width="1088" height="859" alt="image"
src="https://github.com/user-attachments/assets/07f4f8b1-52fa-4136-add4-19b00aefd963"
/>

<img width="1157" height="783" alt="image"
src="https://github.com/user-attachments/assets/1c5be80d-72f8-4ead-8d4b-706a3a04fd73"
/>

<img width="1488" height="777" alt="image"
src="https://github.com/user-attachments/assets/4d743548-f0c3-4579-963b-43676f68fab1"
/>

<img width="1499" height="778" alt="image"
src="https://github.com/user-attachments/assets/f808e44f-ef97-467f-9e41-812e2857c36e"
/>


## 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:

nikolaj_mykola

---------

Co-authored-by: Evan <evanpelle@gmail.com>

resources/lang/en.json

@@ -135,6 +135,7 @@
   },
   "single_modal": {
     "title": "Single Player",
+    "random_spawn": "Random spawn",
     "allow_alliances": "Allow alliances",
     "options_title": "Options",
     "bots": "Bots: ",
@@ -262,6 +263,7 @@
     "player": "Player",
     "players": "Players",
     "waiting": "Waiting for players...",
+    "random_spawn": "Random spawn",
     "start": "Start Game",
     "host_badge": "Host"
   },
@@ -661,10 +663,15 @@
     "copy_clipboard": "Copy to clipboard",
     "copied": "Copied!",
     "failed_copy": "Failed to copy",
+    "spawn_failed": {
+      "title": "Spawn failed",
+      "description": "Automatic spawn selection failed. You can't play this game."
+    },
     "desync_notice": "You are desynced from other players. What you see might differ from other players."
   },
   "heads_up_message": {
-    "choose_spawn": "Choose a starting location"
+    "choose_spawn": "Choose a starting location",
+    "random_spawn": "Random spawn is enabled. Selecting starting location for you..."
   },
   "territory_patterns": {
     "title": "Skins",