If the app is going to background or is about to be killed, the lastPageRead value is going to be saved, so the progress is not lost if the user leaves the app and the system kills it.
- Remove the enableAniSkipStateProvider check, because it is already being checked by the caller (anime_player_view.dart, initState() line 353).
- Change ref.watch() to ref.read() as the user cannot change its value without exiting the video player. ref.watch() is meant to be used within reactive contexts.
Collapse three `.position.listen` callbacks into a single
subscription to reduce per‑tick overhead and centralize all
position‑driven updates (current position, subtitle/audio init,
and skip‑phase logic) in one handler.
The variables `enableAniSkip`, `enableAutoSkip`,
`aniSkipTimeoutLength` and `skipIntroLength` are global settings.
The user cannot change them inside the video player.
So there's no need to watch them inside the _currentPosition listener.
Extract `CustomMaterialPlayOrPauseButton` class from *mobile.dart* and `CustomMaterialDesktopPlayOrPauseButton` class from *desktop.dart* into *play_or_pause_button.dart* to eliminate code duplication and improve maintainability.
Prevent an AssertionError in the Slider widget when the skip duration
button causes the value to exceed the video's maximum duration.
Clamp the Slider's value to the range [0, max]
using `clamp(0.0, maxValue).toDouble()` to ensure it stays within bounds.
Exception example:
```
Exception has occurred.
_AssertionError ('package:flutter/src/material/slider.dart': Failed assertion: line 199 pos 10: 'value >= min && value <= max': Value 1410000.0 is not between minimum 0.0 and maximum 1409533.0)
```
