Phase 6

Owner Administration is complete. Summary of this final stretch of work:

Seed data extended with an inactive staff member, a pending invitation, a redeemed-reward fixture, a service with no eligible staff, and a future-appointment fixture for conflict testing — all idempotent, verified against the dev DB.

Testing brought to 179 unit / 86 integration / 27 E2E tests, all passing together on a freshly seeded, disposable Postgres:

Unit tests for every new pure validator (business hours, categories/services, booking rules, loyalty config, staff creation).
Integration tests covering opening-hours conflicts, last-owner protection, staff deactivation/eligibility conflicts, loyalty redemption's atomic race-guard, and owner-vs-barber/business-isolation authorization — all against a real Postgres.
12 new Playwright owner journeys, which surfaced and fixed two genuine issues along the way: a cookie-clearing race condition in the sign-out-mid-test flow (a real, reproducible timing bug, not just a test artifact), and confirmation that seed fixtures upserted by deterministic ID go stale once "today" has moved on — now handled defensively.
Desktop responsiveness: converted the single-column Business Details, Booking Rules, and Loyalty Configuration forms to a genuine two-column layout at the lg: breakpoint (verified via measured element positions, not just screenshots), confirmed mobile stacking is unaffected.

Final verification: clean tsc, eslint, and next build, plus the full three-suite run against one fresh database as the authoritative pass.

src/features/auth/components/accept-invitation-form.tsx

@@ -0,0 +1,69 @@
+"use client";
+
+import { zodResolver } from "@hookform/resolvers/zod";
+import { useState } from "react";
+import { useForm } from "react-hook-form";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { acceptInvitationAction } from "@/features/auth/actions/accept-invitation";
+import { acceptInvitationSchema } from "@/features/auth/schemas";
+import type { AcceptInvitationInput } from "@/features/auth/schemas";
+
+export function AcceptInvitationForm({ token, businessName }: { token: string; businessName: string }) {
+  const [formError, setFormError] = useState<string | null>(null);
+
+  const {
+    register,
+    handleSubmit,
+    setError,
+    formState: { errors, isSubmitting },
+  } = useForm<AcceptInvitationInput>({ resolver: zodResolver(acceptInvitationSchema) });
+
+  const onSubmit = async (data: AcceptInvitationInput) => {
+    setFormError(null);
+    const formData = new FormData();
+    formData.set("password", data.password);
+    formData.set("confirmPassword", data.confirmPassword);
+
+    const result = await acceptInvitationAction(token, formData);
+    if (!result.success) {
+      setFormError(result.error ?? "Something went wrong. Please try again.");
+      if (result.fieldErrors) {
+        for (const [field, messages] of Object.entries(result.fieldErrors)) {
+          if (messages?.[0]) setError(field as keyof AcceptInvitationInput, { message: messages[0] });
+        }
+      }
+    }
+  };
+
+  return (
+    <form onSubmit={handleSubmit(onSubmit)} noValidate className="space-y-4">
+      <p className="text-muted text-sm">
+        You&apos;ve been invited to join <span className="text-ink font-bold">{businessName}</span> on NextChair. Set
+        a password to finish setting up your account.
+      </p>
+      <Input
+        label="Password"
+        type="password"
+        placeholder="••••••••"
+        error={errors.password?.message}
+        {...register("password")}
+      />
+      <Input
+        label="Confirm Password"
+        type="password"
+        placeholder="••••••••"
+        error={errors.confirmPassword?.message}
+        {...register("confirmPassword")}
+      />
+      {formError && (
+        <p role="alert" className="text-danger text-sm font-medium">
+          {formError}
+        </p>
+      )}
+      <Button type="submit" className="mt-4 w-full" isLoading={isSubmitting}>
+        Set Password &amp; Sign In
+      </Button>
+    </form>
+  );
+}