feat(frontend): add pause and resume action buttons to ScheduleCard for grantor

[libby-coder]

Problem

The pause/resume contract functions are implemented but there is no UI surface for them. Grantors cannot pause a schedule from the dashboard.

What to add

When isGrantor && !schedule.revoked:

• If not paused: show a "Pause" button that calls pause_schedule and refreshes.
• If paused: show a "Resume" button that calls resume_schedule.

Include a confirmation modal similar to the existing RevokeModal.

[omega58754]

@omega58754 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, Good day, please can i work on this issue.
Thank you!

ℹ️ Repo Maintainers: To accept this application, review their application or assign @omega58754 to this issue.

[Songu3020]

@Songu3020 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, I'm Peter — a Full-Stack & Blockchain Developer with 3+ years of experience. I've reviewed this issue and I'm confident I can handle it. I'll submit a clean PR within 1-2 days max. Please assign it to me!

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Songu3020 to this issue.

[drips-wave]

Congratulations, @Songu3020! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @Songu3020: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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