On CLOSED readyState, probes session and redirects to /login only on 401.
On CONNECTING, counts consecutive errors and closes + probes only after 3
failures, preventing infinite retries without killing transient reconnects.
Closes#203
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Replaces the per-component createNotificationStream() factory with a shared
$lib/stores/notifications.svelte.ts singleton. Ref-counted init()/destroy()
ensures one EventSource per tab no matter how many consumers mount
simultaneously.
Motivation: the /chronik "Für dich" box (#285) needs the same live-arrival
stream that NotificationBell already consumes. Two factories would open two
SSE connections per tab — this refactor avoids the silent regression before
it ships.
- New: src/lib/stores/notifications.svelte.ts (module state, refcount)
- New: src/lib/stores/notifications.svelte.spec.ts (proves single EventSource
across multiple consumers + ref-counted teardown)
- Deleted: src/lib/hooks/useNotificationStream.svelte.ts (factory)
- Deleted: src/lib/hooks/__tests__/useNotificationStream.svelte.test.ts
- NotificationBell now imports the singleton
Part of #285.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
