[Test Improver] Add unit tests for ui-context 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/ui-context.ts. This store manages UI context elements (tag-based overlays/annotations). It had zero test coverage despite containing meaningful validation logic in its actions.

Key testable logic:

• actions.add: throws on invalid context (undefined value, falsy tag, null), auto-increments idCounter, generates sequential ctx-N ids
• actions.update/remove: throw when element id not found in state
• getters.all: sorts contexts alphabetically by tag (empty tags sort first)
• mutations.update: silently no-ops for missing element id

Approach

• Tested state() factory, all 3 mutations, the getters.all getter, and all 3 actions
• Used it.each with named-object entries for the 4 invalid-context throw cases
• Avoided testing trivial pass-through behaviour; focused on validation, sorting, and commit calls

Coverage Impact

File	Before	After
shell/store/ui-context.ts	0%	~100% statements

Trade-offs

• Tests use as any casts in a few places because the Element.id TypeScript interface says number but the runtime code assigns string values ('ctx-0'). The type discrepancy is in the source, not the tests.
• No mocking required — pure functions tested directly.

Reproducibility

YARN_IGNORE_ENGINES=true NODE_OPTIONS=--max_old_space_size=8192 yarn test:ci --testPathPattern=shell/store/__tests__/ui-context.test.ts

Test Status

✅ 22 tests passing, 0 failing
✅ ESLint: no warnings or errors

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