fix(dates): use local 'today' for date-input defaults instead of the UTC date

11 form defaults across 6 files used new Date().toISOString().split('T')[0] (the UTC date), which lands on yesterday during the post-midnight Prague window (UTC+1/+2). Added todayLocalStr() (local YYYY-MM-DD) in formatters and replaced them. Future-date expressions (e.g. invoice due_date +14d) left untouched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/pages/AttendanceCreate.tsx

@@ -10,6 +10,7 @@ import { motion } from "framer-motion";
 import AdminDatePicker from "../components/AdminDatePicker";
 import FormField from "../components/FormField";
 import { useApiMutation } from "../lib/queries/mutations";
+import { todayLocalStr } from "../utils/formatters";
 const API_BASE = "/api/admin";
 
 interface CreateForm {
@@ -46,7 +47,7 @@ export default function AttendanceCreate() {
   });
 
   const [form, setForm] = useState<CreateForm>(() => {
-    const today = new Date().toISOString().split("T")[0];
+    const today = todayLocalStr();
     return {
       user_id: "",
       shift_date: today,