Feature: Unified Movement Speed and Zoom-Based Velocity Scaling

[winyunq]

Feature: Unified Movement Speed and Zoom-Based Velocity Scaling

This PR optimizes the camera's kinetic feel by unifying movement calculations and introducing dynamic speed scaling based on zoom altitude.

1. Unification of Movement Variables

• Change: Replaced independent \EdgeScrollSpeed\ and \MoveSpeed\ constants with a unified \NowMoveSpeed\ model.
• Why: Previously, WASD input and Edge Scrolling used separate speed values, leading to inconsistent behavior. By consolidating them, all camera displacement (Keyboard, Edge Scroll, Drag) now shares a unified, predictable velocity model.

2. Zoom-Linked Velocity Scaling

• Change: Implemented linear interpolation (Lerp) for \NowMoveSpeed\ based on current zoom height.
• Why: Fixed-speed cameras feel sluggish at high altitudes and hyper-sensitive at low altitudes. This change ensures a consistent \screen traversal time\ for the player regardless of zoom level, improving overall control precision.

3. Refactored Movement Application

• Change: Updated \ApplyMoveCameraCommands\ and \EdgeScroll\ logic to utilize the shared \NowMoveSpeed.
• Why: Eliminates redundant hardcoded speed injections and ensures that any future changes to the movement curve automatically apply to all input methods.