Module tween_manager 

TweenManager — central hub for managing active tweens across the entire game.

The TweenManager owns a pool of ActiveTweens, each targeting a specific property in the scene (glyph position, camera FOV, bar fill, etc.). Every frame, tick(dt) advances all tweens and applies their values.

Features:

• Start / start_delayed / cancel by ID
• TweenTarget enum covering glyphs, camera, screen, bars, and custom lambdas
• Chaining: on_complete callbacks that can start new tweens
• Group cancellation by tag
• Automatic cleanup of completed tweens

Structs

ActiveTween

A single tween that is currently running or waiting (delayed).

BarId

Opaque handle to a UI bar (HP, MP, XP, etc.).

TweenId

Opaque handle to a running tween.

TweenManager

Central tween manager. Owns all active tweens and provides the game-facing API.

Enums

TweenTarget

What property an active tween drives.