perf: split page css from main bundle

src/features/canvas/CanvasPage.tsx

@@ -28,6 +28,8 @@
 import {
   ReactFlow,
 } from "@xyflow/react";
+import "@xyflow/react/dist/style.css";
+import "../../styles/pages/canvas.css";
 import { useCallback, useEffect, useMemo, useRef, useState, type ChangeEvent, type CSSProperties, type MouseEvent, type WheelEvent } from "react";
 import { aiGenerationClient } from "../../api/aiGenerationClient";
 import { assetClient, type ServerAssetItem } from "../../api/assetClient";