[Test Improver] Add unit tests for notifications store actions

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Goal and Rationale

shell/store/notifications.ts already has a pending PR (#40) covering mutations and getters. The actions layer (markRead, markUnread, markAllRead, and init) had zero test coverage despite containing meaningful branching logic:

• markRead / markUnread: conditional prefs/set dispatch and extension handler invocation
• markUnread: unsetValue fallback to empty string when unset
• markAllRead: iterates over all notifications, dispatching prefs and invoking handlers for each
• init: 7 distinct code paths — missing user data early returns, deriveKey failure, happy path (empty + non-empty localStorage), expired-notification filtering, per-notification decrypt failure, BroadcastChannel message filtering by userId

Approach

• Mocked @shell/utils/crypto/encryption (deriveKey, decrypt, encrypt) to avoid SubtleCrypto unavailability in jsdom
• Mocked @shell/utils/crypto (md5) for deterministic hash output
• Mocked BroadcastChannel globally per test to isolate module-level bc state
• Tested actions in isolation by calling them directly with mock context objects (no full Vuex store wiring needed)
• Used .call({ $extension: mockExtension }, ...) to inject the this.$extension context required by callNotifyHandler

Coverage Impact

File	Coverage added
shell/store/notifications.ts (actions)	markRead, markUnread, markAllRead, init — all major branches

Test Status

✅ All 20 new tests pass
✅ ESLint clean (--max-warnings 0)

Reproducibility

NODE_OPTIONS=--max_old_space_size=8192 ./node_modules/.bin/jest shell/store/__tests__/notifications-actions.test.ts

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