Add ability to restore Cinny's window size and position

[Neved4]

Description

Enables Cinny on macOS to restore its window state from past sessions, using Tauri's window-state.

Fixes #326 #125

Note that v2 isn’t used to prevent conflicts with gtk-3. We might switch to v2 later, but for now we’re sticking with v1 to avoid breaking issues.

Type of change

• [X] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)

Checklist:

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [X] I have commented my code, particularly in hard-to-understand areas
• [X] My changes generate no new warnings

[Neved4]

@kfiven Hey Krishan, any news on this? Sending best wishes

[kfiven]

Hey, could you please also resolve conflicts?

[Neved4]

@kfiven Done!