Frontend: Add campaign detail page improvements — participants, contract state, share

[CelestinaBeing]

Summary

The campaign detail page (frontend/src/CampaignDetail.jsx) renders basic metadata from the API but lacks critical live on-chain information: current participant count, remaining cap, time window countdown, and a share/copy link button. These are expected features of any production campaign page.

Problem

The current detail page shows off-chain metadata only:

• No live participant count from contract
• No cap remaining indicator (e.g. "142 / 500 spots taken")
• No time window countdown ("Ends in 2d 4h 15m")
• No share button (copy URL, share to Twitter/Discord)
• No visual progress bar for campaign fill rate

Acceptance Criteria

• Fetch and display on-chain state alongside API metadata on campaign detail load:
  • get_participant_count() → "X participants registered"
  • get_max_cap() → "X / Y spots" with a progress bar (or "Unlimited" if cap = 0)
  • get_window() → countdown timer if campaign hasn't started; time-remaining if active
  • is_active() → status badge (Active / Paused / Inactive)
• Add a "Share" button that copies the campaign URL to clipboard with a toast confirmation
• Add pre-built share links: Twitter, Discord (copy formatted message), Telegram
• Show a skeleton/loading state while on-chain data fetches
• Show a "Contract not linked" placeholder section if campaignContractId is null
• Add unit tests for the countdown timer logic and on-chain state display

References

• frontend/src/CampaignDetail.jsx
• frontend/src/stellar.js — checkParticipantStatus()
• frontend/src/components/StatusBadge.jsx

[Malcolm-Wander]

@Malcolm-Wander has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello maintainer,I’d love to work on this issue…thank you in advance🙏🏽

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

[Temi-suwa18]

@Temi-suwa18 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I would like to work to on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Temi-suwa18 to this issue.

[drips-wave]

Congratulations, @Temi-suwa18! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @Temi-suwa18: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[drips-wave]

This issue has been completed by @Temi-suwa18 as part of the Stellar Wave Program's 5th Wave 🥳

😎 @Temi-suwa18: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.