Add donor notification delivery and admin test sends

[darthnithin]

Summary

• add notification installations for Expo and web push with register/unregister flows
• deliver donor spend notifications across active installations and add admin-triggered test sends
• expose notification installation status in the admin user snapshot and add a send-test button in the admin panel
• add notification pipeline tests and fix the Vercel mobile-web build path for this branch

Verification

• npm run test:notifications
• npm run dashboard:typecheck
• npm run root:typecheck
• npm run build:mobile-web -w @slugswap/dashboard

[vercel]

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Project	Deployment	Actions	Updated (UTC)
slugswap	Ready	Preview, Comment	Mar 16, 2026 5:47pm

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Align web push service-worker scope with /app route

The configured scope is "/app/", but the web client is served at /app (see the /app rewrite in apps/dashboard/next.config.mjs), so the registration does not control that page URL. Because ensureWebPushSubscription waits on navigator.serviceWorker.ready, web users opening /app can hang indefinitely when enabling spend alerts and never complete subscription/installation registration.

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[darthnithin]

doesn't work yet