Extract state management from inline health page into HealthCenterModel:
- HealthCenterModel.svelte.ts (new): hosts all state atoms (),
derived values (), and core actions (load, filter, delete)
- health page reduced from ~120 to ~27 lines of script — thin shell
delegating to model; only DOM/template concerns remain
- Integration test updated for model-based architecture
- HealthCenterModel.test.ts (new): model invariant tests
busya
26dfde81a5