refactor: remove inventory widget and drag controller

Removes the inventory management system and drag-and-drop
functionality from the STS-like viewer. This includes deleting the
`InventoryWidget`, `InventoryItemSpawner`, and `DragController`
classes, as well as cleaning up references in
`PlaceholderEncounterScene`.

packages/sts-like-viewer/src/scenes/PlaceholderEncounterScene.ts

@@ -1,26 +1,22 @@
-import Phaser from "phaser";
-import { ReactiveScene } from "boardgame-phaser";
-import { createButton } from "@/utils/createButton";
-import { UI_CONFIG, GRID_CONFIG, NODE_COLORS, NODE_LABELS } from "@/config";
-import { MutableSignal } from "boardgame-core";
 import {
   resolveEncounter,
-  removeItem,
   type RunState,
   type EncounterResult,
   type MapNodeType,
   type MapNode,
 } from "boardgame-core/samples/slay-the-spire-like";
-import { InventoryWidget } from "@/widgets/InventoryWidget";
+import { ReactiveScene } from "boardgame-phaser";
+
+import type { MutableSignal } from "boardgame-core";
+
+import { UI_CONFIG, GRID_CONFIG, NODE_COLORS, NODE_LABELS } from "@/config";
+import { createButton } from "@/utils/createButton";
 
 /**
  * 占位符遭遇场景
- *
- * 左侧显示背包网格（使用 InventoryWidget），右侧显示遭遇信息。
  */
 export class PlaceholderEncounterScene extends ReactiveScene {
   private gameState: MutableSignal<RunState>;
-  private inventoryWidget: InventoryWidget | null = null;
 
   constructor(gameState: MutableSignal<RunState>) {
     super("PlaceholderEncounterScene");
@@ -39,30 +35,9 @@ export class PlaceholderEncounterScene extends ReactiveScene {
     const gridH = gridRows * cellSize + (gridRows - 1) * GRID_CONFIG.GRID_GAP;
     const leftPanelW = gridW + 40;
 
-    this.inventoryWidget = new InventoryWidget({
-      scene: this,
-      gameState: this.gameState,
-      x: 60,
-      y: (height - gridH) / 2 + 20,
-      cellSize,
-      gridGap: GRID_CONFIG.GRID_GAP,
-    });
-
     this.cameras.main.setBounds(0, 0, width, height);
     this.cameras.main.setScroll(0, 0);
 
-    // Panel background
-    this.add
-      .rectangle(
-        60 + leftPanelW / 2,
-        this.inventoryWidgetY(gridH),
-        leftPanelW + 10,
-        gridH + 50,
-        0x111122,
-        0.9,
-      )
-      .setStrokeStyle(2, 0x5555aa);
-
     // "背包" title
     this.add
       .text(60 + gridW / 2, (height - gridH) / 2, "背包", {
@@ -92,11 +67,6 @@ export class PlaceholderEncounterScene extends ReactiveScene {
     );
   }
 
-  private inventoryWidgetY(gridH: number): number {
-    const { height } = this.scale;
-    return (height - gridH) / 2 + 20 + gridH / 2;
-  }
-
   private drawRightPanel(
     node: MapNode & { encounter: { name: string; description: string } },
     leftPanelW: number,
@@ -201,15 +171,6 @@ export class PlaceholderEncounterScene extends ReactiveScene {
     const node = state.map.nodes.get(state.currentNodeId);
     if (!node || !node.encounter) return;
 
-    // Clear lost items from inventory
-    if (this.inventoryWidget) {
-      const lostIds = this.inventoryWidget.getLostItems();
-      for (const lostId of lostIds) {
-        removeItem(state, lostId);
-      }
-      this.inventoryWidget.clearLostItems();
-    }
-
     const result: EncounterResult = this.generatePlaceholderResult(node.type);
     resolveEncounter(state, result);
     await this.sceneController.launch("GameFlowScene");