Add Live Queue slide to kiosk rotation

- Added a third kiosk slide showing the active customer queue.
- Customer names are derived from the local-part of their email address.
- Statuses are mapped to friendly labels:
    pending -> Received
    prompt_ready / songs_uploaded -> Trollgorithm Recording in Studio
    revisions_requested -> Waiting for Customer Response
    awaiting_payment -> Payment Due
- Completed/delivered statuses are not shown.
- If the queue overflows, a note points customers to the status page.
- Added queue-only mode (kiosk_cycle_seconds = 1) and updated the
  cycle logic to rotate QR -> pricing -> queue.
- Updated /admin/settings help text for the new mode.

Bumps version to 0.5.3.

app.py

@@ -350,7 +350,10 @@ def get_kiosk_cycle_seconds():
 
 
 def get_kiosk_mode():
-    """Return 'cycle', 'qr', or 'prices' based on kiosk_cycle_seconds setting."""
+    """
+    Return 'qr', 'prices', 'queue', or 'cycle' based on kiosk_cycle_seconds setting.
+    -1 = QR only, 0 = prices only, 1 = queue only, 5+ = cycle through all three.
+    """
     cfg = load_booth_settings()
     try:
         val = int(cfg.get('kiosk_cycle_seconds', 10))
@@ -360,6 +363,8 @@ def get_kiosk_mode():
         return 'qr'
     if val == 0:
         return 'prices'
+    if val == 1:
+        return 'queue'
     return 'cycle'
 
 
@@ -1017,12 +1022,35 @@ def kiosk():
     mode = get_kiosk_mode()
     booth_open = get_booth_open()
 
+    # Build the public queue: only active statuses, mapped to friendly names,
+    # using the local-part of the email as the customer name.
+    KIOSK_STATUS_MAP = {
+        'pending': 'Received',
+        'prompt_ready': 'Trollgorithm Recording in Studio',
+        'songs_uploaded': 'Trollgorithm Recording in Studio',
+        'revisions_requested': 'Waiting for Customer Response',
+        'awaiting_payment': 'Payment Due',
+    }
+    active_statuses = set(KIOSK_STATUS_MAP.keys())
+    raw_queue = list_requests()
+    queue = []
+    for r in raw_queue:
+        if r.get('status') in active_statuses:
+            email = r.get('email') or ''
+            name = email.split('@')[0] if '@' in email else email
+            queue.append({
+                'name': name or 'Guest',
+                'status': KIOSK_STATUS_MAP[r['status']],
+                'raw_status': r['status'],
+            })
+
     return render_template(
         'kiosk.html',
         booth_open=booth_open,
         price_items=price_items,
         cycle_seconds=cycle_seconds,
         mode=mode,
+        queue=queue,
         refresh_seconds=30
     )