Send activation link immediately for walk-in and manual registration accounts

Accounts created by staff on someone's behalf now get their activation
link (email or WhatsApp) sent right away, instead of only on a first
failed login attempt, matching what the Terms of Use already promised.
This also fixed a real account with a real email being silently
activated with a fixed, undisclosed password (Hope123).

Also fixes the self-service kiosk's "Create an account" password field,
which never actually took effect server-side, and removes the "Guest
(no account)" checkboxes that no longer had any backend effect once
every walk-in account started behaving the same way.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/app/dashboard/supervisor/manual-registration/page.tsx

@@ -18,7 +18,6 @@ export default function ManualRegistrationPage() {
   const [name, setName] = useState("");
   const [email, setEmail] = useState("");
   const [phoneNumber, setPhoneNumber] = useState("");
-  const [registerAsGuest, setRegisterAsGuest] = useState(false);
   const [busy, setBusy] = useState(false);
   const [error, setError] = useDismissingState<string | null>(null);
   const [createdReg, setCreatedReg] = useState<any | null>(null);
@@ -43,7 +42,6 @@ export default function ManualRegistrationPage() {
           eventId,
           options: [{ eventOptionId: optionId, quantity }],
           user: { name, ...(email ? { email } : {}), ...(phoneNumber ? { phoneNumber } : {}) },
-          guestOnly: registerAsGuest,
         },
       });
       setCreatedReg(res);
@@ -89,10 +87,7 @@ export default function ManualRegistrationPage() {
             <input className="w-full border rounded px-3 py-2" value={name} onChange={(e) => setName(e.target.value)} required />
           </div>
           <div>
-            <div className="flex items-center justify-between">
-              <label className="block text-sm font-medium">Email</label>
-              <label className="text-xs flex items-center gap-2"><input type="checkbox" checked={registerAsGuest} onChange={e=>setRegisterAsGuest(e.target.checked)} /> Guest (no account)</label>
-            </div>
+            <label className="block text-sm font-medium">Email</label>
             <input type="email" className="w-full border rounded px-3 py-2" value={email} onChange={(e) => setEmail(e.target.value)} placeholder="email@example.com" />
           </div>
         </div>
@@ -100,7 +95,7 @@ export default function ManualRegistrationPage() {
           <label className="block text-sm font-medium">Cell Number</label>
           <input type="tel" className="w-full border rounded px-3 py-2" value={phoneNumber} onChange={(e) => setPhoneNumber(e.target.value)} placeholder="+27…" />
         </div>
-        <p className="text-xs text-gray-500">At least one of email or cell number is required. If no email is provided, a guest account is created automatically.</p>
+        <p className="text-xs text-gray-500">At least one of email or cell number is required. The account is created inactive, and an activation link is sent immediately (by email if provided, otherwise WhatsApp) so the attendee can set their own password.</p>
         {error && <p className="text-sm text-red-600">{error}</p>}
         <button type="submit" disabled={busy} className="bg-brand-600 hover:bg-brand-700 text-white rounded px-4 py-2 disabled:opacity-60">
           {busy ? "Submitting..." : "Create"}