[Test Improver] Add unit tests for useDrawer composable

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Goal and Rationale

shell/composables/drawer.ts (the useDrawer composable) had no test coverage. It wraps slideInPanel Vuex store commits with a typed API for opening/closing drawer panels, and has non-trivial invariant behavior worth validating:

• open() always sets triggerFocusTrap: true regardless of what the caller passes in options
• open() always uses the returnFocusSelector argument, even if options includes a conflicting value
• Options properties are spread before the invariants, meaning the invariants cannot be accidentally overridden by callers

These properties are important for accessibility (focus trap) and focus-return correctness.

Approach

• Mocked vuex.useStore to return a spy commit function
• Called useDrawer() directly (no Vue lifecycle hooks to trigger)
• Used toHaveBeenCalledWith with exact payload shapes for strong assertions
• 7 tests covering: no-options call, options merging, triggerFocusTrap invariant, returnFocusSelector invariant, empty options, close behaviour, and payload arity

Coverage Impact

File	Before	After
shell/composables/drawer.ts	0%	100%

Test Status

PASS shell/composables/drawer.test.ts
Tests: 7 passed, 7 total

Reproducibility

YARN_IGNORE_ENGINES=true NODE_OPTIONS=--max_old_space_size=8192 yarn test:ci --testPathPattern=shell/composables/drawer.test.ts

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