- Add seenByTenant field to BillingLocation interface
- Implement setSeenByTenant function to mark locations as viewed by tenant
- Checks if flag is already set to avoid unnecessary DB updates
- Includes TypeDoc documentation
- Update LocationViewPage to call setSeenByTenant when non-owner visits
- Add seenByTenant to fetchAllLocations projection
- Update LocationCard to show "seen by tenant" status indicator
- Displays in "Monthly statement" fieldset with checkmark icon
- Shows alongside monthly expense total
- Add localization strings for monthly statement and seen status
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Co-Authored-By: Claude <noreply@anthropic.com>
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