fix: sprite disappears in pokemon details when changing pages

[abr-Projects]

Resolves issue #295

Cause:
refresh_gui() clears the entire main layout , recursively deleting all widgets. go_to_box() calls refresh_gui(), so when page changes the detail panel is deleted. the ui maintains a reference to a layout that is invalid, resulting in missing elements

Solution:
Introduce self.selected_pokemon to track the current pokemon in view. So when refresh_gui() is called the detail panel is reconstructed with self.selected_pokemon

[Copilot]

Pull request overview

This PR fixes a bug where the Pokemon sprite and details disappear when changing PC pages after showing Pokemon details. The issue occurred because refresh_gui() clears and rebuilds the entire layout, destroying the details panel widget.

Changes:

• Replaced self.pokemon_details_layout with self.selected_pokemon to track which Pokemon's details should be displayed
• Modified create_gui() to reconstruct the details panel from stored Pokemon data when refresh_gui() is called
• Simplified show_pokemon_details() to just store the Pokemon and trigger a GUI refresh
• Updated on_window_close() to clear the selected Pokemon reference instead of the details layout

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