feat(sts-viewer): implement combat state and fix inventory removal

- Add `createCombatState` to initialize combat using inventory and run
  state
- Implement `runContext` to bridge inventory data with combat logic
- Update inventory to use `removeItem` instead of `removeItemFromGrid`

packages/sts-like-viewer/src/state/combatState.ts

@@ -0,0 +1,62 @@
+import {
+  buildCombatState,
+  CombatState,
+  createRunState,
+  createStartWith,
+  data,
+  generateDeckFromInventory,
+  getAdjacentItems,
+  getItemEffects,
+  IRunContext,
+} from "boardgame-core/samples/slay-the-spire-like";
+import { createInventorySignal } from "./inventory";
+import { GameModule } from "boardgame-core";
+
+export function createCombatState() {
+  const inventory = createInventorySignal(true);
+
+  const deck = generateDeckFromInventory(inventory.value);
+
+  const run = createRunState();
+
+  const encounter = data.desert.getEncounters()[0];
+
+  const effects = getItemEffects(inventory.value);
+  const combat = buildCombatState(
+    {
+      hp: run.currentHp,
+      maxHp: run.maxHp,
+      itemEffects: effects,
+    },
+    deck,
+    encounter,
+  );
+
+  const runContext: IRunContext = {
+    getItemData(id: string) {
+      return inventory.value.items.get(id)?.meta?.itemData || null;
+    },
+    getAdjacentItems(id: string) {
+      return getAdjacentItems(inventory.value, id).keys();
+    },
+    getConsumedUses(id: string) {
+      return inventory.value.items.get(id)?.meta?.consumedUses || 0;
+    },
+    async setConsumedUsesAsync(id: string, uses: number) {
+      await inventory.produceAsync((draft) => {
+        const item = draft.items.get(id);
+        if (!item?.meta) return;
+        item.meta.consumedUses = uses;
+      });
+    },
+  };
+
+  const start = createStartWith((triggers, ctx) => {
+    data.desert.addTriggers(triggers, runContext);
+  }, runContext);
+
+  return {
+    start,
+    createInitialState: () => combat,
+  } as GameModule<CombatState>;
+}

packages/sts-like-viewer/src/state/inventory.ts

@@ -6,7 +6,7 @@ import {
   data,
   GameItemMeta,
   placeItem,
-  removeItemFromGrid,
+  removeItem,
   Transform2D,
   validatePlacement,
 } from "boardgame-core/samples/slay-the-spire-like";
@@ -58,14 +58,14 @@ export function moveItem(
   };
 
   const removed = create(to.value, (inv) => {
-    removeItemFromGrid(inv, itemId);
+    removeItem(inv, itemId);
   });
   const validation = validatePlacement(removed, item.shape, newTransform);
   if (!validation.valid) return false;
 
   batch(() => {
     from.produce((inv) => {
-      removeItemFromGrid(inv, itemId);
+      removeItem(inv, itemId);
     });
     to.produce((inv) => {
       placeItem(inv, {