Web service worker + subscription flow (apps/web)

[codebestia]

In apps/web, add a service worker that subscribes to push using the VAPID public key, posts the subscription to /push/subscriptions, and on push shows a content-free notification that on click focuses/opens the app and triggers a sync. Request permission contextually, not on first load.

Acceptance criteria:

• SW registers + subscribes after user grants permission
• Subscription persisted server-side
• Clicking the notification opens the conversation and syncs

[Killerjunior]

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

Hi maintainer, I have read and understood the issue requirements and checked the necessary documentation. I’m confident I can work on this task effectively and deliver a proper solution.

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

[Tijesunimi004]

@Tijesunimi004 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Maintainer I'd like to work on this issue and I'd get it done in time

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Tijesunimi004 to this issue.

[iamkingvalor]

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

please can i work on this?

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

[drips-wave]

Congratulations, @Tijesunimi004! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @Tijesunimi004: 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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