Fourth master: dwarves get their own side so the yellow AI works; yellow colours and texts; AI cores use the player's throne and heart in their colour

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ai.rs

@@ -296,7 +296,11 @@ impl Game {
             self.rivals[k].attacking = true;
             self.rivals[k].army0 = army;
             if t == self.local_side {
-                let key = if side == 2 { "msg.rival1_attack" } else { "msg.rival2_attack" };
+                let key = match side {
+                    2 => "msg.rival1_attack",
+                    3 => "msg.rival2_attack",
+                    _ => "msg.rival3_attack",
+                };
                 let n = self.creature_count().to_string();
                 self.tell_local(key, vec![n], Some(Sfx::WaveAlarm));
             }