SaveState v2.4b - Hotfix & Stability

This is a maintenance release to address a startup stability issue reported on some Linux distributions and to further optimize the new Nuitka build performance.

Changelog:

🛡️ Startup Stability (Fix #43)

• Missing Folder Recovery: Added a new validation layer at startup. If your GameSaveBackups folder is moved, deleted, or missing, the application will no longer hang or freeze.
• Smart Recovery: SaveState will now detect the missing path and present a dialog allowing you to select a new location or automatically recreate the folder.
• Thanks to @XargonWan for reporting this issue on Fedora!

⚡ Optimizations

• Theme Engine: Improved the Theme Manager logic to prevent redundant stylesheet applications. Theme switching and startup UI rendering should be slightly snappier.
• Settings Migration: Optimized how settings are saved and migrated, skipping identical files to reduce disk I/O.