feat: add Reset Cat button to restore window state

[Kynnnnnna]

This PR adds a Reset Cat button to the shared menu.
It restores the cat window to its initial position and resets related window settings.
Tested to be functional on my Windows single monitor laptop. May require further testing.

Partially addresses #690.

[ayangweb]

That's not correct. Reset only restores the cat window's position and size, and doesn't include other configuration options.

[Kynnnnnna]

Hi, I’ve updated the implementation based on your feedback.

The Reset Cat action now only restores the window’s position to the center of the primary monitor and resets the cat scale to a consistent default (75%) for a predictable visual reset.

Thanks for the guidance!

[th-dd]

That's not correct. Reset only restores the cat window's position and size, and doesn't include other configuration options.

Perhaps the configuration items can be restored separately in the preference settings
That is, the taskbar/right-click cat can be restored to its initial position, and the preference settings window can restore configuration items

[th-dd]

This allows users to choose whether to restore the cat's position or all configuration items.

[ayangweb]

#764

Added configuration item for window position.