[Feat]: Refresh app visuals and improve data handling

[Akuqt]

Pull Request

Description

Summary

This changes update the app’s icons and splash screen, improves long press selection behavior, and updates total calculation logic. It also includes documentation updates.

Features

• New app icon, adaptive icon, and splash screen assets.
• Updated total calculation for selected debtors and movements.
• Improved long press selection logic.

Fixes

• Fixed splash screen background color in light theme.

Docs

• Updated README and CONTRIBUTING files.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• My code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.

Screenshots (if applicable)

N/A

Additional Notes

N/A

[Akuqt]

🚀 Expo preview is ready!

• Project → debtors
• Platforms → android, ios
• Scheme → dbts
• Runtime Version → 1.0.0
• More info

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