🧹 Extract string literals 'Lavoro' and 'Riposo' into constants

[TargetMisser]

🎯 What
Extracted the hardcoded string literals 'Lavoro' and 'Riposo' into reusable constants (SHIFT_TITLE_WORK and SHIFT_TITLE_REST) in a new file src/constants/shifts.ts. Updated the entire codebase to utilize these constants instead of the raw strings.

💡 Why
This improves maintainability by centralizing the definitions for these important, frequently used domain concepts. It reduces duplication, prevents typos, and makes any future changes or localization efforts regarding these shift titles significantly easier and safer.

✅ Verification

1. Verified that the constants were correctly imported and used throughout src/screens, src/utils, and src/widgets.
2. Ran npm run typecheck which confirmed there are no TypeScript compilation errors.
3. Ran npx jest --passWithNoTests to confirm no tests were broken.
4. Tested locally to ensure string manipulations match the original format.

✨ Result
A cleaner, more maintainable codebase free of magic string literals for core shift types, resulting in enhanced safety and readbility.

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PR created automatically by Jules for task 4361916221772028880 started by @TargetMisser

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Project	Deployment	Actions	Updated (UTC)
flight-work-app	Ready	Preview, Comment, Open in v0	Apr 6, 2026 1:57pm