feat(suff): UX improvements and bug fixes

- Style "Spenden" link as a compact right-aligned button
- Replace radio buttons with checkboxes for Gratis/Direkt-bezahlt (toggleable)
- Remove "Sonstiges" from payment method dropdown
- Disable submit buttons on form submit to prevent double-clicks and give loading feedback (fixes drink_id=None bug caused by disabled button value not being submitted)
- Block weak PINs (sequential and repeated digits)
- Limit usernames to 2–20 characters
- Style PIN errors consistently with other error messages
- Add self-service "PIN ändern" page, shown above Logout in 2-column layout
- Highlight own username in orange badge (matching staff-target cyan style)
- Update booking window: 2026-05-30 10:00 – 2026-06-14 22:00

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

gaehsnitz/static/suff/style.css

@@ -140,6 +140,25 @@ button {
     transition: transform 80ms ease, background-color 100ms ease;
 }
 
+a.btn-primary {
+    display: block;
+    width: fit-content;
+    margin-left: auto;
+    background-color: #EE9933;
+    color: #161616;
+    font-size: 1rem;
+    font-weight: bold;
+    padding: 10px 18px;
+    border-radius: 6px;
+    cursor: pointer;
+    text-decoration: none;
+    transition: background-color 100ms ease;
+}
+
+a.btn-primary:hover, a.btn-primary:focus {
+    background-color: #FFCC77;
+}
+
 button:active {
     transform: scale(0.96);
 }
@@ -480,6 +499,14 @@ section {
     border: 1px solid rgba(102, 221, 238, 0.4);
 }
 
+.self-username {
+    color: #EE9933;
+    background-color: rgba(238, 153, 51, 0.12);
+    padding: 0 8px;
+    border-radius: 4px;
+    border: 1px solid rgba(238, 153, 51, 0.4);
+}
+
 .confirm-actions > button,
 .confirm-actions > a {
     flex: 1;
@@ -520,10 +547,42 @@ section {
     color: #FFCC77;
 }
 
-.logout-form {
+.bottom-actions {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 12px;
     margin-top: 24px;
 }
 
+.bottom-actions form {
+    margin: 0;
+}
+
+.bottom-actions button {
+    width: 100%;
+}
+
+.btn-secondary-link {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 14px 20px;
+    font-size: 1.1rem;
+    font-weight: bold;
+    border-radius: 6px;
+    border: 2px solid #885522;
+    color: #885522;
+    text-decoration: none;
+    text-align: center;
+    min-height: 52px;
+    box-sizing: border-box;
+}
+
+.btn-secondary-link:hover, .btn-secondary-link:focus {
+    background-color: rgba(80, 40, 10, 0.4);
+    color: #FFCC77;
+}
+
 .toast {
     background-color: rgba(238, 153, 51, 0.15);
     border: 2px solid #EE9933;

gaehsnitz/suff.py

@@ -22,11 +22,9 @@ User = get_user_model()
 ANONYMOUS_USERNAME = "anonym"
 
 BERLIN = ZoneInfo("Europe/Berlin")
-# TEST WINDOW (2026-05-15 – 2026-05-31): enabled early for pre-festival testing.
+# Festival window: 2026-05-30 10:00 – 2026-06-14 22:00 Berlin time.
-# Original festival phase: BOOKING_START = 2026-06-11, BOOKING_END = 2026-06-14.
+BOOKING_START = datetime(2026, 5, 30, 10, 0, 0, tzinfo=BERLIN)
-# Switch back to original dates before the festival.
+BOOKING_END = datetime(2026, 6, 14, 22, 0, 0, tzinfo=BERLIN)
-BOOKING_START = datetime(2026, 5, 15, 0, 0, 0, tzinfo=BERLIN)
-BOOKING_END = datetime(2026, 5, 31, 23, 59, 59, tzinfo=BERLIN)
 
 DAY_BY_WEEKDAY = {3: 1, 4: 2, 5: 3, 6: 4}
 DAY_CUTOFF_HOUR = 6
@@ -67,7 +65,13 @@ def _current_festival_day():
 
 
 def _normalize_name(raw):
-    return slugify(raw or "")[:150]
+    return slugify(raw or "")[:20]
+
+
+def _username_error(username):
+    if len(username) < 2:
+        return "Name muss mindestens 2 Zeichen lang sein."
+    return None
 
 
 def _user_has_activity(user):
@@ -78,6 +82,17 @@ def _is_anonymous(user):
     return user.username == ANONYMOUS_USERNAME
 
 
+_WEAK_PINS = {"123", "234", "345", "456", "567", "678", "789", "987", "876", "765", "654", "543", "432", "321"} | {d * 3 for d in "0123456789"}
+
+
+def _pin_error(pin):
+    if not (pin.isdigit() and len(pin) == 3):
+        return "PIN muss aus genau 3 Ziffern bestehen."
+    if pin in _WEAK_PINS:
+        return "Diese PIN ist zu einfach. Bitte eine andere wählen."
+    return None
+
+
 def _staff_required(view):
     def wrapped(request, *args, **kwargs):
         if not request.user.is_authenticated:
@@ -126,7 +141,7 @@ def _tab_context(user):
         "paid": paid,
         "open_balance": total - paid,
         "user_payments": payments,
-        "payment_methods": UserPayment.Method.choices,
+        "payment_methods": [(m, l) for m, l in UserPayment.Method.choices if m != "other"],
     }
 
 
@@ -142,8 +157,8 @@ def name_view(request):
     if request.method == "POST":
         raw_name = request.POST.get("name", "")
         username = _normalize_name(raw_name)
-        if not username:
+        if not username or (error := _username_error(username)):
-            error = "Bitte einen Namen eingeben."
+            error = error or "Bitte einen Namen eingeben."
         else:
             try:
                 existing = User.objects.get(username=username)
@@ -186,8 +201,8 @@ def pin_view(request):
     error = None
     if request.method == "POST":
         pin = request.POST.get("pin", "")
-        if not (pin.isdigit() and len(pin) == 3):
+        if error := _pin_error(pin):
-            error = "PIN muss aus genau 3 Ziffern bestehen."
+            pass
         elif mode == "create":
             if User.objects.filter(username=username).exists():
                 error = "Name bereits vergeben."
@@ -242,6 +257,26 @@ def pin_view(request):
     )
 
 
+@login_required
+@require_http_methods(["GET", "POST"])
+def change_pin_view(request):
+    redirect, phase = _require_open(request)
+    if redirect:
+        return redirect
+
+    error = None
+    if request.method == "POST":
+        pin = request.POST.get("pin", "")
+        if error := _pin_error(pin):
+            pass
+        else:
+            request.user.set_pin(pin)
+            request.user.save()
+            return HttpResponseRedirect(reverse("suff:me"))
+
+    return render(request, "suff/change_pin.html", {"phase": phase, "error": error})
+
+
 @login_required
 @require_http_methods(["GET"])
 def me_view(request):
@@ -447,10 +482,12 @@ def staff_register_view(request):
 
         if not username:
             error = "Bitte einen Namen eingeben."
+        elif error := _username_error(username):
+            pass
         elif User.objects.filter(username=username).exists():
             error = "Name bereits vergeben."
-        elif pin and not (pin.isdigit() and len(pin) == 3):
+        elif pin and (error := _pin_error(pin)):
-            error = "PIN muss aus genau 3 Ziffern bestehen (oder leer lassen)."
+            pass
         else:
             user = User(username=username)
             if pin:
@@ -484,8 +521,8 @@ def staff_pin_reset_view(request, username):
     error = None
     if request.method == "POST":
         pin = (request.POST.get("pin") or "").strip()
-        if not (pin.isdigit() and len(pin) == 3):
+        if error := _pin_error(pin):
-            error = "PIN muss aus genau 3 Ziffern bestehen."
+            pass
         else:
             target.set_pin(pin)
             target.save()

gaehsnitz/suff_urls.py

@@ -2,6 +2,7 @@ from django.urls import path
 
 from gaehsnitz.suff import (
     book_view,
+    change_pin_view,
     closed_view,
     dashboard_view,
     delete_consumption_view,
@@ -28,6 +29,7 @@ urlpatterns = [
     path("closed/", closed_view, name="closed"),
     path("pin/", pin_view, name="pin"),
     path("me/", me_view, name="me"),
+    path("me/change-pin/", change_pin_view, name="change_pin"),
     path("book/", book_view, name="book"),
     path("book/<int:consumption_id>/delete/", delete_consumption_view, name="delete_consumption"),
     path("pay/", pay_view, name="pay"),

gaehsnitz/templates/suff/base.html

@@ -14,5 +14,30 @@
             <h1>Suff</h1>
             {% block content %}{% endblock %}
         </main>
+        <script>
+        // Track last clicked submit button so its value survives being disabled on submit.
+        document.addEventListener('click', function(e) {
+            var btn = e.target.closest('button[type="submit"], button:not([type])');
+            if (!btn || !btn.form) return;
+            var form = btn.form;
+            var existing = form.querySelector('input[data-submitter]');
+            if (existing) existing.remove();
+            if (btn.name) {
+                var hidden = document.createElement('input');
+                hidden.type = 'hidden';
+                hidden.name = btn.name;
+                hidden.value = btn.value;
+                hidden.setAttribute('data-submitter', '1');
+                form.appendChild(hidden);
+            }
+        });
+        document.addEventListener('submit', function(e) {
+            var form = e.target;
+            form.querySelectorAll('button[type="submit"], button:not([type])').forEach(function(btn) {
+                btn.disabled = true;
+                btn.style.opacity = '0.5';
+            });
+        });
+        </script>
     </body>
 </html>

gaehsnitz/templates/suff/change_pin.html

@@ -0,0 +1,19 @@
+{% extends "suff/base.html" %}
+
+{% block content %}
+<h2>PIN ändern</h2>
+
+{% if error %}<p class="error">{{ error }}</p>{% endif %}
+
+<form method="post" action="{% url 'suff:change_pin' %}">
+    {% csrf_token %}
+    <label>
+        Neue PIN:
+        <input type="text" name="pin" inputmode="numeric" pattern="[0-9]{3}" maxlength="3"
+               minlength="3" required autofocus autocomplete="off" />
+    </label>
+    <button type="submit">PIN speichern</button>
+</form>
+
+<p><a href="{% url 'suff:me' %}">Abbrechen</a></p>
+{% endblock %}

gaehsnitz/templates/suff/me.html

@@ -1,7 +1,7 @@
 {% extends "suff/base.html" %}
 
 {% block content %}
-<h2>Hallo {{ tab_user.username }}</h2>
+<h2>Hallo <span class="self-username">{{ tab_user.username }}</span></h2>
 
 <p class="intro">
     Tipp dich rein, sobald du was trinkst. Am Ende deines Besuchs kannst du
@@ -55,13 +55,24 @@
         <form method="post" action="{% url 'suff:book' %}">
             {% csrf_token %}
             <label class="for-free-toggle">
-                <input type="radio" name="booking_mode" value="for_free" />
+                <input type="checkbox" name="booking_mode" value="for_free" />
                 <span>Gratis (z.B. Artists am Spieltag)</span>
             </label>
             <label class="for-free-toggle">
-                <input type="radio" name="booking_mode" value="cash_paid" />
+                <input type="checkbox" name="booking_mode" value="cash_paid" />
                 <span>Direkt bar bezahlt</span>
             </label>
+            <script>
+            document.querySelectorAll('input[name="booking_mode"]').forEach(function(cb) {
+                cb.addEventListener('change', function() {
+                    if (this.checked) {
+                        document.querySelectorAll('input[name="booking_mode"]').forEach(function(other) {
+                            if (other !== cb) other.checked = false;
+                        });
+                    }
+                });
+            });
+            </script>
             <div class="drink-grid">
                 {% for drink in drinks %}
                     <button type="submit" name="drink_id" value="{{ drink.id }}" class="drink-btn drink-btn-{{ drink.category }}">
@@ -113,8 +124,11 @@
     </div>
 {% endif %}
 
-<form method="post" action="{% url 'suff:logout' %}" class="logout-form">
+<div class="bottom-actions">
+    <a href="{% url 'suff:change_pin' %}" class="btn-secondary btn-secondary-link">PIN ändern</a>
+    <form method="post" action="{% url 'suff:logout' %}">
         {% csrf_token %}
         <button type="submit" class="btn-secondary">Logout</button>
-</form>
+    </form>
+</div>
 {% endblock %}

gaehsnitz/templates/suff/pin.html

@@ -13,7 +13,7 @@
     <p>Gib deine 3-stellige PIN ein.</p>
 {% endif %}
 
-{% if error %}<p><b>{{ error }}</b></p>{% endif %}
+{% if error %}<p class="error">{{ error }}</p>{% endif %}
 
 <form method="post" action="{% url 'suff:pin' %}">
     {% csrf_token %}