⚡[Feature]: Standardize Day Types and Improve Initial Data

[PPeitsch]

Description

This pull request addresses the inconsistency in the application's default data by standardizing all initial absence codes to English. It improves the out-of-the-box user experience and enhances code quality.

Key changes include:

• The data initialization script (init_data.py) now seeds the database with a universal set of English-language absence codes (e.g., "Sick Leave", "Vacation") instead of the previous Spanish examples.
• The initialization script has been refactored to improve readability by extracting the default codes into a module-level constant.
• The redundant and unused ABSENCE_CODES list has been removed from config.py, establishing the database as the single source of truth.

Type of Change

• Bug fix
• New feature
• Refactoring
• Documentation update
• UI/UX improvement
• Code style update
• Test coverage
• Configuration change

Testing

The changes were verified manually through the following steps:

1. Deleted the local database to simulate a fresh installation.
2. Ran the database initialization script: python init_db.py.
3. Launched the application.
4. Navigated to the Settings -> Absence Codes page and confirmed that the new, standardized English codes were correctly populated.
5. Navigated to the Manual Entry page and verified that the "Type" dropdown also contained the new English codes.

Screenshots

A screenshot of the "Existing Absence Codes" table on the Settings page would be appropriate here to show the new default values.

Checklist

• I have followed the project's code style (Black, isort, PEP 8)
• My code generates no new warnings
• I have added tests for new functionality
• All tests pass locally
• I have updated the documentation where necessary
• I have run pre-commit hooks before submitting

Fixes #32

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
app/utils/init_data.py	0.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
app/config/config.py	100.00% <ø> (ø)
app/utils/init_data.py	0.00% <0.00%> (ø)

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