perf(canvas): 画布渲染 - 增加节点渲染预算与性能模式控制

web/src/lib/canvas/canvas-render-budget.ts

@@ -0,0 +1,12 @@
+export const CANVAS_MAX_RENDERED_NODES = 720;
+export const CANVAS_MAX_RENDERED_CONNECTIONS = 5000;
+
+export function canvasNodeRenderPadding(previouslyRendered: boolean) {
+    return previouslyRendered ? 384 : 192;
+}
+
+export function canvasNodeRenderBudget(scale: number) {
+    if (scale < 0.14) return 280;
+    if (scale < 0.28) return 420;
+    return CANVAS_MAX_RENDERED_NODES;
+}