[Test Improver] Add unit tests for growl store

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🤖 This PR was created by Test Improver, an automated AI assistant focused on improving test coverage.

Goal and Rationale

Add unit tests for shell/store/growl.js. The growl store manages transient notification banners and contains non-trivial logic that was completely untested:

• add mutation — enforces a MAX_GROWLS = 5 cap (evicts the oldest on overflow) and prepends new items with an auto-incremented id and a timestamp
• close action — conditionally dispatches notifications/markRead only when the growl carries a linked notification id
• notification action — maps NotificationLevel values to color/icon pairs and skips levels that don't warrant a growl (Announcement, Task, Info, Hidden)

These rules are easy to break accidentally — the tests codify and guard them.

Approach

• Unit-test state factory, find/byId getters, all three mutations, and the close/notification actions
• Mutations are called directly against a plain state object (no Vuex store needed)
• Actions are tested by injecting { commit, dispatch, getters } mocks
• notification action uses it.each to cover all four skipped levels and all three committed levels

Coverage Impact

File	Before	After
shell/store/growl.js	0%	~90% statements

Test Status

✅ 25 tests pass, 0 failures, 0 lint warnings

PASS shell/store/__tests__/growl.test.ts
Tests: 25 passed, 25 total

Reproducibility

yarn test:ci --testPathPattern='shell/store/__tests__/growl.test.ts'

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