Extract hardcoded UI strings in stream detail page into a central copy module (i18n prep)

[Austinaminu2]

Description

`app/app/stream/[id]/page.tsx` has 8+ literal UI strings (labels, buttons, status text) inline in JSX, which blocks any future translation/i18n work.

Location

`app/app/stream/[id]/page.tsx`

Task

Extract the hardcoded strings into a central copy constants module (e.g. `lib/copy/stream-detail.ts`), and reference them from the component, as a first step toward i18n-readiness.

Good for contributors because

Mechanical extraction task with a clear before/after, same pattern as the companion create-form issue.

[Favournne]

@Favournne has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer, I've reviewed the description and I know what I must do to solve the issue. Please assign

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

[Joel234-png]

@Joel234-png has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hey maintainer, I'd like to show you what am capable of doing. Kindly assign this to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Joel234-png to this issue.

[drips-wave]

Congratulations, @Joel234-png! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Joel234-png: 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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