Bug: Triple-click does not select all text in a node if followed by a DecoratorBlockNode

When triple-clicking within a text node, Lexical normally selects all the text in that node as expected. However, if the text node is immediately followed by a DecoratorBlockNode, triple-clicking instead results in a collapsed selection at the start of the node, rather than selecting the entire contents.

This behavior does not occur when the DecoratorBlockNode is not immediately after the text node.

**Video showing this in action**

https://github.com/user-attachments/assets/f55439c5-6b36-4732-9df3-1fcc4530167c

Lexical version: 0.32.1

## Steps To Reproduce
1. Open the [Lexical Playground](https://playground.lexical.dev/) and create a text node with some content.
3. Insert a DecoratorBlockNode directly after it, e.g. by adding a YouTube video (here I added https://www.youtube.com/watch?v=_maPaQy9jWY).
4. Triple-click anywhere within the text node.
5. Observe the selection behavior and notice how the cursor moves to the start of the line.

## The current behavior

The selection collapses to the start of the text node.

## The expected behavior

All text within the node should be selected.