bug(MatTree): padding is not recomputed when moving a node inside/outside an expandable node

### Is this a regression?

- [ ] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

_No response_

### Description

As `TreeControl` is deprecated, I started migrating to the latest API using `childrenAccessor`. So far so good, except for one case not working any more.

I'm using `matTreeNodePadding` and `matTreeNodePaddingIndent` on ``. When I move a node inside/outside of an expandable node, padding is not recomputed as-is.

Expanding/collapsing the parent node in which the node was moved, will recompute its padding though.

### Reproduction

Minimal example on [Stackblitz](https://stackblitz.com/~/github.com/poirierlouis/ng-issue-29959).

Steps to reproduce:
1. Open link
2. Open preview in a new tab
3. Open both folders (`/` and `home`)
4. Follow instructions to move a node outside its parent node

`dataSource` is updated with a new array, using the same items. Can it be a source of error? Should the entire tree be cloned somehow, to trigger changes detection down to padding computation?

### Expected Behavior

When a node is moved inside/outside of an expandable node (level is changed), padding should be recomputed based on the new level of the node.

### Actual Behavior

Padding of the node is not updated when moving the node inside/outside of an expandable node.

### Environment

- Angular: 18.2.10
- CDK/Material: 18.2.11
- Browser(s): Firefox / Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): Windows

从链接的 StackBlitz 复现开始，检查使用 childrenAccessor 并在可展开的父节点之间移动节点时 matTreeNodePadding 的行为。跟踪节点层级如何变化以及 padding 如何重新计算，然后验证移动节点会更新其 padding，而不会展开或折叠父节点。

由索引模型根据 Issue 内容生成。