Revert "2026-06-26 시작 고래 사운드"

This reverts commit 3617ebe51e.

Assets/08_Timeline/Timeline_WhaleAttack.playable

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 --- !u!114 &443422495961915861
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@@ -584,18 +490,6 @@ MonoBehaviour:
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---- !u!114 &2281746906628976311
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Assets/11_Audio/Source/Etc.meta

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Assets/11_Audio/Source/Etc/WhaleAttack.wav.meta

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