[Vallykrie]

**What

This PR implements the core visual synchronization and rendering systems required by the ECS architecture, fulfilling Issue #91 and its sub-tasks (#94, #97).

• RenderSystem: Synchronizes all entity SpriteComponent node positions to their underlying logical TransformComponent position.
• Entity Facing: Adjusts the xScale of PlayerEntity nodes automatically so players face the correct direction (player.facing).
• Projectile Rotation: Dynamically sets the zRotation of the ProjectileEntity to align with its trajectory based on its VelocityComponent using atan2.
• Projectile Trail: Added a programmatic SKEmitterNode particle trail that follows the bread/toaster during flight.
• TrajectoryRenderSystem: Ensured the trajectory arc renders as a dashed/dotted line (dashingWithPhase) and cleanly clears itself when exiting AimState.
• AnimationSystem: Centralized animation loop cleanly processes and drains all queued SKActions per frame.

Why

• Strict ECS Compliance: We need a "single writer" for visual updates to prevent race conditions and stuttering. Physics and logic systems only modify the TransformComponent, and the RenderSystem cleanly maps that data to SpriteKit at the end of the frame.
• Visual Polish: Projectiles flying without rotation or trails look unnatural. Dynamically aligning the projectile angle to its velocity makes the physics feel impactful, while the dashed trajectory arc clearly communicates aiming intentions to the player as described in the GDD.

How

• Render Loop: RenderSystem.update() is called at the very end of GameScene.update(). It extracts TransformComponent and SpriteComponent to update .position.
• Math: Used atan2(velocity.dy, velocity.dx) to calculate the continuous angle of flight for any entity with a VelocityComponent.
• Arc Styling: Updated CGMutablePath handling in TrajectoryRenderSystem to use .copy(dashingWithPhase: 0, lengths: [10.0, 10.0]) before assigning it to the SKShapeNode.
• Trail: Instantiated an SKEmitterNode directly in ProjectileEntity's initialization, utilizing a fallback white particle config since we don't have an .sks asset yet.

Notes

• Closes [TASK-10] Render System, Animation System & Trajectory Render System #91
• Resolves Define the bread rotation and trail visual requirements #94
• Resolves Implement RenderSystem.update(deltaTime:) — entity sync + BreadEntity sync + bread rotation #97
• The SKEmitterNode trail currently uses a programmatic fallback (white squares). If we add a dedicated spark.png or BreadTrail.sks to our Assets.xcassets later, this code will automatically pick it up and look even better.