feat: add linear booking workflow — Новая → Связались → Подтверждено/Отказ

- Add status + confirmed_date columns to group_bookings (migration #10)
- Linear flow: Новая shows "Связались →", Связались shows date picker + "Отказ"
- Date picker for confirmation allows only today and future dates
- Confirmed bookings show the scheduled date
- Filter chips: Все / Новая / Связались / Подтверждено / Отказ with counts
- Declined bookings sorted to bottom of list
- "Сбросить" button on confirmed/declined to restart flow

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/lib/db.ts

@@ -200,6 +200,19 @@ const migrations: Migration[] = [
       `);
     },
   },
+  {
+    version: 10,
+    name: "add_group_booking_status",
+    up: (db) => {
+      const cols = db.prepare("PRAGMA table_info(group_bookings)").all() as { name: string }[];
+      if (!cols.some((c) => c.name === "status")) {
+        db.exec("ALTER TABLE group_bookings ADD COLUMN status TEXT NOT NULL DEFAULT 'new'");
+      }
+      if (!cols.some((c) => c.name === "confirmed_date")) {
+        db.exec("ALTER TABLE group_bookings ADD COLUMN confirmed_date TEXT");
+      }
+    },
+  },
 ];
 
 function runMigrations(db: Database.Database) {
@@ -581,9 +594,13 @@ interface GroupBookingRow {
   notified_confirm: number;
   notified_reminder: number;
   reminder_status: string | null;
+  status: string;
+  confirmed_date: string | null;
   created_at: string;
 }
 
+export type BookingStatus = "new" | "contacted" | "confirmed" | "declined";
+
 export interface GroupBooking {
   id: number;
   name: string;
@@ -594,6 +611,8 @@ export interface GroupBooking {
   notifiedConfirm: boolean;
   notifiedReminder: boolean;
   reminderStatus?: string;
+  status: BookingStatus;
+  confirmedDate?: string;
   createdAt: string;
 }
 
@@ -628,10 +647,21 @@ export function getGroupBookings(): GroupBooking[] {
     notifiedConfirm: !!r.notified_confirm,
     notifiedReminder: !!r.notified_reminder,
     reminderStatus: r.reminder_status ?? undefined,
+    status: (r.status || "new") as BookingStatus,
+    confirmedDate: r.confirmed_date ?? undefined,
     createdAt: r.created_at,
   }));
 }
 
+export function setGroupBookingStatus(id: number, status: BookingStatus, confirmedDate?: string): void {
+  const db = getDb();
+  if (status === "confirmed" && confirmedDate) {
+    db.prepare("UPDATE group_bookings SET status = ?, confirmed_date = ? WHERE id = ?").run(status, confirmedDate, id);
+  } else {
+    db.prepare("UPDATE group_bookings SET status = ?, confirmed_date = NULL WHERE id = ?").run(status, id);
+  }
+}
+
 export function updateGroupBooking(
   id: number,
   name: string,