fix: date validation, pre-fill on re-edit, MS_PER_DAY constant

- Extract MS_PER_DAY constant to lib/constants.ts
- ConfirmModal date: max=1 year, rejects past dates and malformed years
- ConfirmModal pre-fills existing date + group when re-editing (✎)
- Confirmed date display handles malformed dates gracefully
- Red border + error for invalid dates, submit disabled

src/app/admin/bookings/page.tsx

@@ -4,6 +4,7 @@ import { useState, useEffect, useMemo, useCallback, useRef } from "react";
 import { createPortal } from "react-dom";
 import { Phone, Instagram, Send, ChevronDown, ChevronRight, Bell, CheckCircle2, XCircle, Clock, Star, Calendar, DoorOpen, X, Plus } from "lucide-react";
 import { adminFetch } from "@/lib/csrf";
+import { MS_PER_DAY } from "@/lib/constants";
 import { type BookingStatus, type BookingFilter, type SearchResult, BOOKING_STATUSES, SHORT_DAYS, fmtDate } from "./types";
 import { LoadingSpinner, ContactLinks, BookingCard, StatusBadge, StatusActions, DeleteBtn } from "./BookingComponents";
 import { GenericBookingsList } from "./GenericBookingsList";
@@ -40,6 +41,8 @@ function ConfirmModal({
   open,
   bookingName,
   groupInfo,
+  existingDate,
+  existingGroup,
   allClasses,
   onConfirm,
   onClose,
@@ -47,6 +50,8 @@ function ConfirmModal({
   open: boolean;
   bookingName: string;
   groupInfo?: string;
+  existingDate?: string;
+  existingGroup?: string;
   allClasses: ScheduleClassInfo[];
   onConfirm: (data: { group: string; date: string; comment?: string }) => void;
   onClose: () => void;
@@ -59,10 +64,12 @@ function ConfirmModal({
 
   useEffect(() => {
     if (!open) return;
-    setDate(""); setComment("");
-    // Try to match groupInfo against schedule to pre-fill
-    if (groupInfo && allClasses.length > 0) {
-      const info = groupInfo.toLowerCase();
+    const tomorrow = new Date(Date.now() + MS_PER_DAY).toISOString().split("T")[0];
+    setDate(existingDate && existingDate.length === 10 ? existingDate : tomorrow); setComment("");
+    // Try to match groupInfo or existingGroup against schedule to pre-fill
+    const matchText = existingGroup || groupInfo;
+    if (matchText && allClasses.length > 0) {
+      const info = matchText.toLowerCase();
       // Score each class against groupInfo, pick best match
       let bestMatch: ScheduleClassInfo | null = null;
       let bestScore = 0;
@@ -86,7 +93,7 @@ function ConfirmModal({
       }
     }
     setHall(""); setTrainer(""); setGroup("");
-  }, [open, groupInfo, allClasses]);
+  }, [open, groupInfo, existingDate, existingGroup, allClasses]);
 
   // Cascading options
   const halls = useMemo(() => [...new Set(allClasses.map((c) => c.hall))], [allClasses]);
@@ -132,7 +139,8 @@ function ConfirmModal({
   useEffect(() => { if (!open) initRef.current = false; }, [open]);
 
   // #11: Keyboard submit
-  const canSubmit = group && date;
+  const today = open ? new Date().toISOString().split("T")[0] : "";
+  const canSubmit = group && date && date.length === 10 && date >= today;
   const handleSubmit = useCallback(() => {
     if (canSubmit) {
       const groupLabel = groups.find((g) => g.value === group)?.label || group;
@@ -152,7 +160,6 @@ function ConfirmModal({
 
   if (!open) return null;
 
-  const today = new Date().toISOString().split("T")[0];
   const selectClass = "w-full rounded-lg border border-white/[0.08] bg-white/[0.04] px-3 py-2 text-sm text-white outline-none focus:border-gold/40 [color-scheme:dark] disabled:opacity-30 disabled:cursor-not-allowed";
 
   return createPortal(
@@ -194,10 +201,14 @@ function ConfirmModal({
               type="date"
               value={date}
               min={today}
+              max={new Date(Date.now() + MS_PER_DAY * 365).toISOString().split("T")[0]}
               disabled={!group}
               onChange={(e) => setDate(e.target.value)}
-              className={selectClass}
+              className={`${selectClass} ${date && (date < today || date.length !== 10) ? "!border-red-500/50" : ""}`}
             />
+            {date && (date < today || date.length !== 10) && (
+              <p className="text-[10px] text-red-400 mt-1">{date < today ? "Дата не может быть в прошлом" : "Неверный формат даты"}</p>
+            )}
           </div>
           <div>
             <label className="text-[11px] font-medium text-neutral-400 mb-1 block">Комментарий <span className="text-neutral-600">(необязательно)</span></label>
@@ -303,10 +314,15 @@ function GroupBookingsTab({ filter, onDataChange }: { filter: BookingFilter; onD
           <>
             {b.groupInfo && <span className="text-xs text-neutral-400 bg-neutral-800 rounded-full px-2 py-0.5">{b.groupInfo}</span>}
             {(b.confirmedGroup || b.confirmedDate) && (
-              <span className="text-[10px] text-emerald-400/70">
+              <button
+                onClick={(e) => { e.stopPropagation(); setConfirmingId(b.id); }}
+                className="text-[10px] text-emerald-400/70 hover:text-emerald-300 transition-colors cursor-pointer"
+                title="Изменить"
+              >
                 {b.confirmedGroup}
-                {b.confirmedDate && ` · ${new Date(b.confirmedDate + "T12:00").toLocaleDateString("ru-RU", { day: "numeric", month: "short" })}`}
-              </span>
+                {b.confirmedDate && b.confirmedDate.length === 10 && ` · ${new Date(b.confirmedDate + "T12:00").toLocaleDateString("ru-RU", { day: "numeric", month: "short" })}`}
+                {" ✎"}
+              </button>
             )}
           </>
         )}
@@ -316,6 +332,8 @@ function GroupBookingsTab({ filter, onDataChange }: { filter: BookingFilter; onD
         open={confirmingId !== null}
         bookingName={confirmingBooking?.name ?? ""}
         groupInfo={confirmingBooking?.groupInfo}
+        existingDate={confirmingBooking?.confirmedDate}
+        existingGroup={confirmingBooking?.confirmedGroup}
         allClasses={allClasses}
         onClose={() => setConfirmingId(null)}
         onConfirm={handleConfirm}
@@ -572,7 +590,7 @@ function DashboardSummary({ onNavigate }: { onNavigate: (tab: Tab) => void }) {
 
   useEffect(() => {
     const today = new Date().toISOString().split("T")[0];
-    const tomorrow = new Date(Date.now() + 86400000).toISOString().split("T")[0];
+    const tomorrow = new Date(Date.now() + MS_PER_DAY).toISOString().split("T")[0];
 
     Promise.all([
       adminFetch("/api/admin/group-bookings").then((r) => r.json()),