[Test Improver] Add unit tests for uiplugins 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/uiplugins.ts. This store manages UI plugin registration (add, remove, track load errors, readiness). It had zero test coverage despite the removePlugin mutation containing meaningful index-search-and-splice logic worth protecting.

Approach

• Imported state, getters, and mutations directly from the store module
• Used a minimal PluginStub interface ({ name: string }) cast as Plugin to avoid constructing the full class
• Exercised all four mutations and the state factory; skipped trivial pass-through actions (one-line commit() wrappers)

Tests written (19 total):

Group	Cases
state	empty plugins array, empty errors object, ready=false, fresh copy per call
getters	plugins, errors, ready return corresponding state slices
mutations.setError	new entry, falsy value, overwrites existing, distinct names
mutations.addPlugin	append to empty list, append to existing list
mutations.removePlugin	removes match, no-op when absent, removes only matching entry, removes first duplicate
mutations.setReady	set true, set false

Coverage Impact

New file: shell/store/__tests__/uiplugins.test.ts (19 tests). The uiplugins store module was previously uncovered.

Trade-offs

• Actions (setError, addPlugin, removePlugin, setReady) omitted — all are one-line commit() wrappers with no branching logic.

Reproducibility

YARN_IGNORE_ENGINES=true NODE_OPTIONS=--max_old_space_size=8192 yarn test:ci --testPathPattern=shell/store/__tests__/uiplugins

Test Status

✅ All 19 tests pass. ESLint reports no warnings.

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