[Test Improver] Add unit tests for features store

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

Goal and Rationale

shell/store/features.js had zero test coverage. This store is a critical piece of Rancher's feature-flag system — it controls whether features like multi-cluster management, RKE2, Fleet, and Harvester are active. The get getter has meaningful branching logic (unknown feature throws, found entry wins over default, fallback to registered default), making it a good target for regression protection.

Approach

• Tested getters.get across all three code paths: unknown feature name (throws), feature entry exists in management store (returns entry.enabled), and no entry (falls back to registered default)
• Tested actions.loadServer for both the guarded and unguarded paths (canList true vs. false), and that it returns the findAll result
• Tested mapFeature helper: get() delegates to the store getter with the correct feature name; set() always throws

Table-driven it.each used for the entry-enabled/disabled cases and the fallback-default cases.

Coverage Impact

Metric	Before	After
features.js statements	0%	~85%
features.js functions	0%	~86%
features.js branches	0%	~80%

Trade-offs

• The definitions object is module-level state, populated at import time by the create(...) calls. Tests use the pre-registered constants (MULTI_CLUSTER, LEGACY, RKE2) directly — no mocking of module internals needed.
• mapFeature.get() is a Vue computed helper tested with .call(context) rather than a full component mount, keeping tests lightweight.

Reproducibility

# Run these tests only
NODE_OPTIONS=--max_old_space_size=8192 yarn test:ci --testPathPattern=shell/store/__tests__/features.test.ts

# Run all unit tests
NODE_OPTIONS=--max_old_space_size=8192 yarn test:ci

Test Status

✅ 11 tests passing, 0 failures, 0 lint warnings

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