- The project create-modal start/end dates used raw <input type="date">;
converted to <AdminDatePicker> so every date field in the app now goes
through the shared component (react-datepicker on desktop, native on touch).
- AdminDatePicker now defaults its placeholder by mode (date 'dd.mm.rrrr',
month 'mm.rrrr', time 'hh:mm') so empty date fields always show a format
hint; explicit placeholders (e.g. 'Od'/'Do' range filters) still override.
- Dropped WarehouseReceiptForm's ad-hoc 'dd.mm.yyyy' so it inherits the
unified Czech default.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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