fix: support fullscreen toggle on mobile

Author: kt3k

model/character.ts

@@ -416,14 +416,20 @@ export class MainCharacter extends Character {
     }
     if (this.#lastMoveTypes.length === 4) {
       if (this.#lastMoveTypes.every((t) => t === "bounce")) {
-        document.removeEventListener("keyup", toggleFullscreen)
-        document.addEventListener("keyup", toggleFullscreen, { once: true })
+        bindToggleFullscreen()
         this.#lastMoveTypes = []
       }
     }
   }
 }
 
+function bindToggleFullscreen() {
+  document.removeEventListener("keyup", toggleFullscreen)
+  document.addEventListener("keyup", toggleFullscreen, { once: true })
+  document.body.removeEventListener("touchend", toggleFullscreen)
+  document.body.addEventListener("touchend", toggleFullscreen, { once: true })
+}
+
 function toggleFullscreen() {
   if (document.fullscreenElement) {
     document.exitFullscreen()