Andrew Charlwood f38ccfc128 feat: implement data loading from SQLite (Task 3.2) ...

- Add load_data() method to AppState that connects to SQLite database
- Populate available_drugs, available_directorates, available_indications from DB
- Detect latest date in dataset and set filter defaults accordingly
- Load KPI values: total_records, unique_patients, total_drugs, total_cost
- Add on_load handler to trigger data loading on page initialization
- Handle database errors gracefully with meaningful error messages

2026-02-04 14:11:03 +00:00

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