🎨 (signer-utils): Moved ApplicationChecker into SignerUtils

[fAnselmi-Ledger]

📝 Moved ApplicationChecker into SignerUtils

As the class was used in both SignerETH and SignerSOL I moved the ApplicationChecker into SignerUtils pkg to avoid code duplication

❓ Context

• JIRA or GitHub link: DSDK-851

✅ Checklist

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• Covered by automatic tests
• Changeset is provided
• Documentation is up-to-date
• Impact of the changes:
  • list of the changes

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🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.

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Project	Deployment	Review	Updated (UTC)
device-sdk-ts-sample	Ready	Preview, Comment	Dec 16, 2025 3:25pm

1 Skipped Deployment

Project	Deployment	Review	Updated (UTC)
doc-device-management-kit	Ignored		Dec 16, 2025 3:25pm

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[aussedatlo]

[COULD] private isCompatible = false; and use this.isCompatible = true; if needed. In general is clearer to read without negation and you should have less impacted lines