Simon Franken 4f23c1c653 feat: implement monthly targets and work-day-aware balance calculation ...

Add support for monthly and weekly targets with work-day selection:
- Users can now set targets as 'monthly' or 'weekly'
- Users select which days of the week they work
- Balance is calculated per working day, evenly distributed
- Target hours = (periodHours / workingDaysInPeriod)
- Corrections are applied at period level
- Daily balance tracking replaces weekly granularity

Database changes:
- Rename weekly_hours -> target_hours
- Add period_type (weekly|monthly, default=weekly)
- Add work_days (integer array of ISO weekdays, default=[1,2,3,4,5])
- Add constraints for valid period_type and non-empty work_days

Backend:
- Rewrite balance calculation in ClientTargetService
- Support monthly period enumeration
- Calculate per-day targets based on selected working days
- Update Zod schemas for new fields
- Update TypeScript types

Frontend:
- Add period type selector in target form (weekly/monthly)
- Add work days multi-checkbox selector
- Conditional start date input (week vs month)
- Update DashboardPage to show 'this period' instead of 'this week'
- Update ClientsPage to display working days and period type
- Support both weekly and monthly targets in UI

Migration:
- Add migration to extend client_targets table with new columns
- Backfill existing targets with default values (weekly, Mon-Fri)

2026-02-24 18:11:45 +01:00

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