Export filename:
- Include username for multi-user/instance distinction
- Include timestamp with time (YYYYMMDD-HHMM) instead of date only
- Example: medassist-export-daniel-20260216-2108.json
Import confirmation:
- Show friendly 'Import Data?' dialog on empty instances instead of
scary 'Replace All Data?' warning with danger button
- Only show destructive warning when there is existing data to replace
- Use primary button style for empty-state import
Closes#231
Daniel Volz
08a18fc14a