Improve PWA install lifecycle and offline fallback behavior

[grantfox-oss]

Harden the install/update flow and offline strategy so users experience safe refresh timing, reliable caching, and clear states when the app transitions between online and offline conditions.

• Affected files: app/frontend/src/components/PWAHandler.tsx, app/frontend/src/app/layout.tsx, app/frontend/src/app/offline/page.tsx, app/frontend/src/app/manifest.ts, app/frontend/public/sw.js, app/frontend/src/app/page.tsx, app/frontend/src/components/ErrorReportingShell.tsx, app/frontend/README.md
• Acceptance criteria:
  • Installation and update prompts appear only in eligible contexts and are dismissed without breaking navigation.
  • Offline fallback pages are shown gracefully when cached routes are unavailable.
  • Cache/versioning strategy is documented and aligned with deployment behavior.

[ReinaMaze]

GM Maintainer! Can I get assigned to work on this? I’ve gone through the issue and understand what’s needed.
I’ll work on the PWA install/update flow, offline handling, cache versioning, and the necessary documentation and tests.

ETA: 48 hours.

[somotochukwu-dev]

Hi
Please assign this issue to me
Thanks

[grantfox-oss]

🦊 GrantFox — @ReinaMaze has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #527)
2. Your PR will be reviewed by the BlockDash-Studios maintainers

Good luck! Track your progress on GrantFox.

[MaryammAli]

@ReinaMaze
what is the update on this issue

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Third Campaign campaign!

@ReinaMaze's PR #559 was approved and merged by @MaryammAli.

🏆 @ReinaMaze: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (815 total points). Track your full progress on GrantFox.

👏 Great work, @ReinaMaze! Keep contributing to BlockDash-Studios.