Port the remaining battle items, the stats screen and hBattleTurn at the menu

- Run every non-ball item effect usable in battle from the ROM's
  ItemEffects: Full Restore, revives, bitter medicine, Bitter Berry, Ethers
  and Elixers, X items, X Accuracy, Guard Spec, Dire Hit and Poké Doll.
- Read happiness changes from HappinessChanges, including the larger
  level-up gain where a Pokémon was caught.
- Model hBattleTurn at the battle menu, including the trainer AI's writes,
  and drop the status-heal refusal.
- Port the stats screen for battles and Bill's PC.
- Compare the send-out and withdraw texts, RestoreHealth, RestorePP,
  ChangeHappiness and CalcPlayerStats with the original routines.

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

src/game/world/world.ts

@@ -241,7 +241,7 @@ export interface BattleView {
   /** A choice the battle is waiting for, if any. */
   prompt?: Extract<
     BattleEffect,
-    { kind: "action" | "yesno" | "forget" | "stats" | "name" | "party" }
+    { kind: "action" | "yesno" | "forget" | "stats" | "name" | "party" | "move" }
   >;
   /** Yes/No cursor, as on the original boxes. */
   selected: 0 | 1;
@@ -1822,6 +1822,7 @@ export class GameWorld {
               this.assets.map(this.mapId).landmark,
             ),
           tutorial: effect.tutorial,
+          landmark: this.assets.map(this.mapId).landmark,
         });
         this.battle = { engine, selected: 1 };
         this.battleRun = engine.run();
@@ -1853,6 +1854,10 @@ export class GameWorld {
         this.townMap = true;
         this.dialogue = { pages: ["Town Map"], index: 0 };
         return true;
+      case "stats":
+        this.statsScreen = effect.mon;
+        this.dialogue = { pages: ["Stats"], index: 0 };
+        return true;
       case "menu":
         this.dialogue = {
           pages: effect.pages.length ? effect.pages : [""],
@@ -2248,6 +2253,7 @@ export class GameWorld {
     this.script = undefined;
     this.memScript ??= script.memScript;
     this.townMap = false;
+    this.statsScreen = undefined;
     this.dialogue = undefined;
     this.emote = undefined;
     this.picture = undefined;
@@ -2275,6 +2281,7 @@ export class GameWorld {
     this.spawned = script.rollback.spawned;
     this.script = undefined;
     this.townMap = false;
+    this.statsScreen = undefined;
     this.dialogue = undefined;
     this.emote = undefined;
     this.picture = undefined;
@@ -2346,14 +2353,16 @@ export class GameWorld {
       return;
     this.pumpBattle(name);
   }
-  /** Answer a battle Yes/No (1/0), the move to forget (0-3, 4 cancels)
-   * or a party menu (a party index, or -1 to go back). */
+  /** Answer a battle Yes/No (1/0), the move to forget (0-3, 4 cancels),
+   * a party menu (a party index, or -1 to go back) or an item's move
+   * choice (0-3, or -1 to go back). */
   battleChoose(answer: number) {
     const prompt = this.battle?.prompt;
     if (
       prompt?.kind === "yesno" ||
       prompt?.kind === "forget" ||
-      prompt?.kind === "party"
+      prompt?.kind === "party" ||
+      prompt?.kind === "move"
     )
       this.pumpBattle(answer);
   }
@@ -2372,6 +2381,7 @@ export class GameWorld {
     if (prompt?.kind === "yesno") return this.pumpBattle(0);
     if (prompt?.kind === "forget") return this.pumpBattle(4);
     if (prompt?.kind === "party" && prompt.cancel) return this.pumpBattle(-1);
+    if (prompt?.kind === "move") return this.pumpBattle(-1);
     if (prompt?.kind === "stats") return this.pumpBattle();
     if (!prompt && view.message?.prompt) this.pumpBattle();
   }
@@ -2695,6 +2705,8 @@ export class GameWorld {
   /** One overworld tick. `held` is the direction the player is holding. */
   /** Overworld ticks run so far, for presentation such as tile animation. */
   townMap = false;
+  /** The Pokémon a script's stats screen shows (Bill's PC). */
+  statsScreen: PartyMon | undefined;
   ticks = 0;
 
   tick(held?: Direction) {
@@ -2723,6 +2735,7 @@ export class GameWorld {
         ) {
           if (--dialogue.holdTicks <= 0) {
             this.townMap = false;
+            this.statsScreen = undefined;
             this.dialogue = undefined;
             this.pump();
           }
@@ -3144,6 +3157,7 @@ export class GameWorld {
       return;
     }
     this.townMap = false;
+    this.statsScreen = undefined;
     this.dialogue = undefined;
     this.pump();
   }
@@ -3214,6 +3228,7 @@ export class GameWorld {
     )
       return;
     this.townMap = false;
+    this.statsScreen = undefined;
     this.dialogue = undefined;
     this.pump(answer);
   }
@@ -3475,6 +3490,7 @@ export class GameWorld {
     this.tilesWalked = save.tilesWalked;
     this.playerId = save.playerId;
     this.townMap = false;
+    this.statsScreen = undefined;
     this.dialogue = undefined;
     this.emote = undefined;
     this.picture = undefined;