2D Vector dataclass

dataclass + operator overloading.

dataclass OOP math

Implement `@dataclass class Vector2D(x: float, y: float)` with:
- `__add__`, `__sub__` — vector operations
- `__mul__(scalar: float)` — scalar multiplication
- `dot(other) -> float` — dot product
- `magnitude() -> float` — Euclidean length

Constraints

x, y are floats.

Example

v = Vector2D(3, 4)
v.magnitude()  # 5.0
Vector2D(1,2) + Vector2D(3,4)  # Vector2D(4,6)

20 points ~18 min

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Hints

math.sqrt(x**2 + y**2) for magnitude.

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