Calculator

Release 🧪 "v2.0.0":

Note from developers 💻:
• We have overhauled the calculator's layout and decoupled the arithmetic logic into a pure precision module.

Fixes 🐛:
• Solved stability and switching issues in the language selection menu.

New 👶:
• Overhauled the UI with premium Light and Dark themes.
• Added Degrees/Radians unit toggles for trigonometric calculations.
• Calculation history now tracks and displays the angle unit used.