chore: Typescript: Rewrite Savings

[Maschga]

• ✍️ rewrite Savings folder to Typescript

TODO:

• fix test @naltatis

[sourcery-ai]

Hey @Maschga - I've reviewed your changes - here's some feedback:

• Consider defining dedicated interfaces for API responses instead of using inline casting with as for improved type safety and maintainability.
• Consider consistently using PropType for defining component props, even for basic types like String or Boolean, for better clarity.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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