Add a "stream completed" celebratory/notification state on the detail page

[Chuks-coderr]

Description

When a stream naturally reaches its end time (status becomes Completed), the detail page currently has no distinct UI state for this — it should clearly communicate completion rather than looking identical to an active stream.

Acceptance Criteria

• Feature is fully implemented
• Tests pass
• Lint/type checks pass
• PR references this issue number

Notes

⚠️ Do not begin coding until you have been assigned by the maintainer.
Branch as feat/N-short-title where N is this issue number.

[Luchi5544]

@Luchi5544 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello Maintainer, please assign me to work on this issue will deliver effective result.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Luchi5544 to this issue.

[laragrey]

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

hi, can i work on this?

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

[drips-wave]

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

🧑‍💻 @laragrey: 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 🌊