PWA + service worker for offline-friendly demo

[truthixify]

Tier: M (2-4 days) Type: feature

Context

Convert demo to a PWA: installable, fast cold load, friendly offline shell.

Scope

• vite-plugin-pwa configured
• Manifest (name, icons, theme color matching dark monochrome)
• App shell precached, RPC short-TTL runtime cache
• Update-available toast
• Offline shell with friendly message + cached Activity view
• Install prompt UI on mobile

Acceptance criteria

• Manifest + icons committed
• SW strategy implemented + tested
• Lighthouse PWA score ≥ 90
• Offline behavior verified

Files to start with

• vite.config.ts
• New: src/components/InstallPrompt.tsx, OfflineShell.tsx, UpdateToast.tsx

[ajulaybeeb]

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

Hi Maintainer, I have reviewed the description of the issue and would like to hop on this issue and deliver ETA

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

[somgoli]

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

gm gm, I have carefully reviewed this issue description and acceptance criteria and will like to work on this please. ETA is 6hours. Please assign me this, thanks

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

[drips-wave]

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

🧑‍💻 @somgoli: 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 🌊

[truthixify]

@somgoli Assigned. Welcome to wave 6.

Quick expectations:

1. Branch from develop (not main). PRs target develop. (Note: I just changed the GitHub default to develop so it should auto-pick now.)
2. Open a draft PR within ~3 days of pickup so we can see direction.
3. Update at least every 5 days. Silence is the only thing that costs you the assignment.
4. Hit the acceptance criteria in the issue body. That's the merge bar.

If anything is ambiguous, ask on the issue before building.