Update Sharprompt to 3.1.2 to fix crash in small terminal

[PtJade Ceramic (PtJade-Ceramic)]

📖 Description

Upgrades Sharprompt from 2.4.5 to 3.1.2 to fix a crash (ArgumentOutOfRangeException at Console.SetCursorPosition) that occurs when the terminal window is too small. The upstream fix, shibayan/Sharprompt#373, is included in Sharprompt 3.1.2.

🔗 References

Fixes #697

🔍 Validation

• Compiled successfully with Sharprompt 3.1.2 (Sharprompt.dll 3.1.2.0 linked into output)
• 113/129 unit tests pass; the 16 failures are all environment-related (14 require CI runsettings WingetPkgsTestRepoOwner; 2 are localization-dependent FieldValidationTests on non-English system locale) and unrelated to this change

✅ Checklist

• Signed the Contributor License Agreement
• Linked to an issue
• Updated documentation (if applicable)
• Updated Copilot instructions (if build, architecture, or conventions changed)

📋 Issue Type

• Bug fix

Microsoft Reviewers: Open in CodeFlow

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