bug(MatSlider): MatSliderThumb stays active after drag ending

### 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

When you start dragging slider **MatSliderThumb** became active. Sometimes, it doesn't loose active state, when you ending dragging. It stays active even after click outside. Only way to 'release' it - drag it again.

Within this issue **dragStart** event is fired, but **dragEnd** not. Variable **_isActive** of MatSliderThumb stays true.
That leads to inconsistence of MatSliderThumb view (it looks as active all time) and **makes setting it's value programmatically impossible** (if you are trying to set Value from component).

Bug is not stable but can be easily reproduced at official doc examples.
Mostly occur, when dragging ends little lower than MatSliderThumb position.

https://github.com/user-attachments/assets/77b99e5e-5bb4-4a47-9442-d7a3fbd5e423

### Reproduction

StackBlitz link: https://stackblitz.com/edit/ikftbm?file=src%2Fexample%2Fslider-overview-example.html
Steps to reproduce:
1. Drag slider a little
2. Release on bottom side

### Expected Behavior

dragEnd should be fired each time when user actually ending it.

### Actual Behavior

Sometimes dragEnd event is not fired after actual dragging end.

### Environment

- Angular: 18
- CDK/Material: 18
- Browser(s): Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): MacOS

リンクされた StackBlitz の例で示されている MatSliderThumb のドラッグ処理から始め、Chrome で少しドラッグして下側で離すことで不具合を再現します。ポインターを離す際の dragStart イベントと dragEnd イベント、および _isActive の状態を追跡します。完了条件は、完了したすべてのドラッグで dragEnd が発生し、thumb がアクティブなままにならず、その後にプログラムによる値の変更が機能することです。

索引モデルが issue の本文から書いたものです。