[Bug]: Deprecated API Usage

### Operating system

None

### Publii version

v.0.47.1 (build 17302)

### Post editor

Block editor

### Bug description

**Location:** `app/src/components/block-editor/components/Block.vue:278`

**Problem:** Using deprecated `window.getSelection().empty()`

### Steps to reproduce

_No response_

### Relevant log output

```shell

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