Per-conversation + global push preferences

[codebestia]

Respect mute settings: no push for muted conversations (reuse conversation_members.isMuted) and a global per-device toggle. Apply before dispatch.

Acceptance criteria:

• Muted conversations produce no push
• Global per-device opt-out honored
• Preference checks happen before send

[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.

[0xratnendra]

@0xratnendra has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi. I have reviewed this issue and would like to work on it....ETA 3hr

ℹ️ Repo Maintainers: To accept this application, review their application or assign @0xratnendra to this issue.

[drips-wave]

Congratulations, @0xratnendra! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @0xratnendra: 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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