[Frontend] Add a build-info footer showing version, commit SHA, and network

[Akpolo]

https://t.me/+DOylgFv1jyJlNzM0

Why this matters

There is no way to tell which build of the frontend a user is running, which network it targets, or whether a deploy actually shipped. During an active contributor wave with frequent deploys, support and QA constantly ask "is this the new version?". A small footer reading the build SHA + Stellar network makes deploys verifiable and pairs with the backend GET /version endpoint (#881).

Acceptance criteria

• Expose the commit SHA and network at build time via NEXT_PUBLIC_* env (or Next build metadata)
• Render a subtle footer/badge in the dashboard layout showing version + network (testnet/mainnet)
• Optionally fetch and display the backend version from GET /version ([Backend] Add GET /version endpoint exposing build SHA, build time, and contract IDs #881) to flag frontend/backend drift
• Accessible, unobtrusive, hidden from print; strings via i18n

Files to touch

• frontend/src/app/[locale]/layout.tsx or a shared footer component
• frontend/next.config / env wiring
• frontend/messages/*.json

Out of scope

• The backend /version endpoint ([Backend] Add GET /version endpoint exposing build SHA, build time, and contract IDs #881)
• Full release-notes UI

[temisan0x]

@temisan0x has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi team, I will love to take on this task

ℹ️ Repo Maintainers: To accept this application, review their application or assign @temisan0x to this issue.

[drips-wave]

Congratulations, @temisan0x! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @temisan0x: 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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[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @temisan0x as part of the Stellar Wave Program's 5th Wave 🥳

Moderator's reason: [Auto-assessed] The PR #981 directly and comprehensively addresses the issue by implementing build-time environment variable injection, adding a dedicated footer component with i18n support, and updating the project layout. Although CI is currently 'unstable', the contributor has clarified that these failures are pre-existing on the main branch, and there are no maintainer objections.

😎 @temisan0x: You earned 100 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.

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ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.