Let flyers path over water and lava everywhere

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

src/rival.rs

@@ -366,7 +366,7 @@ impl Game {
             e.repath = 1.5;
             // attackers dig their way like heroes; the player's creatures only walk
             let goal = |i: usize| self.target_core_adjacent(i, target);
-            let found = if e.side() == 0 { self.map.search(cur, self.map.walk_cost(), goal, true) } else { self.map.search(cur, self.map.hero_cost(), goal, true) };
+            let found = if e.side() == 0 { self.map.search(cur, self.map.creature_cost(flies(e.kind)), goal, true) } else { self.map.search(cur, self.map.hero_cost_as(flies(e.kind)), goal, true) };
             match found {
                 Some(p) => e.path = p,
                 None => {
@@ -411,7 +411,7 @@ impl Game {
             e.repath = 3.0 + self.rng.f() * 3.0;
             let (tx, ty) = if d2 > 36.0 { (hx, hy) } else { (hx + self.rng.f() * 8.0 - 4.0, hy + self.rng.f() * 8.0 - 4.0) };
             if self.map.walk(tx as i32, ty as i32) {
-                if let Some(p) = self.map.path_to(e.tile(), idx(tx as i32, ty as i32)) {
+                if let Some(p) = self.map.creature_path(flies(e.kind), e.tile(), idx(tx as i32, ty as i32)) {
                     e.path = p;
                 }
             }