Add LTB spell description

[Kiriawen]

LTB Spell Description. Fixes #7239

---

Important

Adds a new spell preparation message to base-spells.yaml.

• Behavior:
  • Adds a new spell preparation message: "Eschewing motions and sound, you painstakingly focus your mind solely on creating" to prep_messages in base-spells.yaml.

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[ellipsis-dev]

Important

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1. data/base-spells.yaml:1668

• Draft comment:
  The PR title indicates adding the LTB spell description, but I couldn’t clearly identify a new description field or change for an LTB spell. Please verify that the intended LTB (likely the missing Lethargy/‘LTB’ spell) now includes its proper description.
• Reason this comment was not posted:
  Comment was not on a location in the diff, so it can't be submitted as a review comment.

2. data/base-spells.yaml:1

• Draft comment:
  The diff appears extremely large; please ensure only the LTB spell description change is included, with no unintentional reformatting or unrelated modifications.
• Reason this comment was not posted:
  Comment was not on a location in the diff, so it can't be submitted as a review comment.

Workflow ID: wflow_07YvOaYDhUEApGXU

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