Added Scale import for use in game config.

[emilje]

main.js still used Phaser.Scale instead of named imports. Added Scale and replaced usage.

Uncaught ReferenceError: Phaser is not defined at main.js:17:15

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Note

Low Risk
Low risk: a small import/reference fix in the Phaser game bootstrap that only affects scaling configuration and resolves a runtime Phaser is not defined error.

Overview
Fixes the Phaser bootstrap to stop referencing the global Phaser object by importing Scale from phaser and using Scale.FIT/Scale.CENTER_BOTH in src/game/main.js game config.

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