- Change API endpoints from /api/tests to /api/test (singular form)
- Refactor search: split single search field into separate code and name inputs
- Add new ThresholdTab.svelte component for threshold management
- Update TestFormModal to include threshold configuration
- Refactor RefNumTab, RefTxtTab, and TechDetailsTab for improved UX
- Update tests page to use separate TestSiteCode and TestSiteName search params
- Improve test data table with better pagination and search handling
- Consolidate fragmented test modal components into unified TestFormModal.svelte
- Reorganize reference range components into organized tabs (RefNumTab, RefTxtTab)
- Add new tab components: BasicInfoTab, TechDetailsTab, CalcDetailsTab, MappingsTab, GroupMembersTab
- Move test-related type definitions to src/lib/types/test.types.ts for better type organization
- Delete old component files: TestModal.svelte and 10+ sub-components
- Add backup directory for old component preservation
- Update AGENTS.md with coding guidelines and project conventions
- Update tests.js API client with improved structure
- Add documentation for frontend test management architecture
