Contract: Add is_session_key_active view function

[wheval]

Contract: Add is_session_key_active view function

Description:
Consumers currently need custom logic to evaluate session key active status.

Context:
A dedicated view simplifies SDK and UI state checks.

Requirements:

• Add is_session_key_active(public_key) read function
• Return false for missing or expired keys
• Add tests for active, expired, and missing cases

Files to Modify:

• contracts/account/src/lib.rs

Definition of Done:

• Implementation is complete for this single task
• Contract tests updated or added where needed
• Existing contract tests remain green

Labels: security, Stellar Wave
Estimated Effort: 1 day
Priority: Medium

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[Nathydre]

@Nathydre has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

i would love to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Nathydre to this issue.