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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>