refactor(vue-nodes): typed TransformState InjectionKey, safer ResizeObserver sizing, centralized slot tracking, and small readability updates

src/renderer/core/layout/injectionKeys.ts

@@ -0,0 +1,18 @@
+import type { InjectionKey } from 'vue'
+
+import type { Point } from '@/renderer/core/layout/types'
+
+export interface TransformState {
+  screenToCanvas: (p: Point) => Point
+  canvasToScreen: (p: Point) => Point
+  camera?: { x: number; y: number; z: number }
+  isNodeInViewport?: (
+    nodePos: ArrayLike<number>,
+    nodeSize: ArrayLike<number>,
+    viewport: { width: number; height: number },
+    margin?: number
+  ) => boolean
+}
+
+export const TransformStateKey: InjectionKey<TransformState> =
+  Symbol('transformState')