[WIP] Add splashscreen to app and refactor config handling

[Copilot]

Implementation Plan

• 1. Create Tauri config file for window configurations (move window settings from lib.rs)
• 2. Add splashscreen window configuration to tauri.conf.json
• 3. Create splashscreen HTML/component
• 4. Update lib.rs to use config-based window setup instead of dynamic creation
• 5. Add initialization logic to load connections and close splashscreen
• 6. Update frontend to handle splashscreen lifecycle
• 7. Test the splashscreen shows during startup
• 8. Test that the app loads properly after splashscreen closes
• 9. Run code review
• 10. Run security checks

Original prompt

Add a splashscreen to the app.

Then, we load the app and all necessary info like last opened connection, etc...

Then when we're done,close the splashscreen

We should als move the app configs to the appropriate config file i stead of building wverything in the lib.rs dynamically!!!

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