Add Tests for useAlertSnoozes Hook

[Mosas2000]

Description

The alert snooze hook has no tests. frontend/src/hooks/useAlertSnoozes.ts has no corresponding test file, so alert snooze create/cancel/list logic is untested.

Requirements and context

• Add useAlertSnoozes.test.tsx
• Cover snooze creation, cancellation, and listing
• Use MSW for API mocking per existing conventions
• Ensure tests pass under the frontend vitest config

Suggested execution

Fork the repo and create a branch

git checkout -b test/hooks-use-alert-snoozes

Implement changes

• Add the hook test file
• Cover happy paths and error states
• Verify with npm run test --workspace=frontend

Example commit message

test: add tests for useAlertSnoozes hook

Guidelines

• Assignment required before starting
• PR must include a closing reference to this issue
• Timeframe: 72 hours