Andrew Charlwood 6c3b3abf03 feat: improve error handling with user-friendly messages (Task 5.3) ...

- Updated all error messages to be more descriptive and actionable
- Verified error states render correctly in UI (loading, error, empty)
- Confirmed filter handlers check data_loaded before applying filters
- Error handling covers: missing DB, empty DB, SQLite errors, filter errors

2026-02-04 19:20:57 +00:00

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