refactor(core): CORE-14 split typed settings and scope tree lifetimes

test/types/setting-model.ts

@@ -0,0 +1,20 @@
+import { findItem, formatTree, traverseTree, treeBinding } from '../../packages/artplayer/src/setting/model'
+
+const item = { name: 'custom', payload: 42, selector: [{ name: 'child' }] }
+const result = formatTree({ id: 0 }, [item])
+const payload: number = result[0]!.payload
+const binding = treeBinding(item)
+const events: (() => void)[] = binding.events
+const found = findItem(result, 'absent')
+const nullable: typeof found | null = null
+traverseTree(result, (node) => {
+  const name: string | undefined = node.name
+  void name
+})
+// @ts-expect-error A tree item can be missing; find must not promise a DOM node.
+const element: HTMLElement = found
+// @ts-expect-error Item names are strings.
+formatTree({ id: 0 }, [{ name: 12 }])
+// @ts-expect-error The generated-name counter is numeric.
+formatTree({ id: '0' }, [item])
+void [payload, events, nullable, element]